(Free Canva Template) Sea Animals And Mermaid Birthday Party Kits

Planning the Perfect Under the Sea Bash

There’s something so magical about the ocean—the shimmering blues, the playful sea creatures, and the endless possibilities for adventure. If your child dreams of swimming with dolphins, playing with mermaids, or discovering treasure under the waves, an Under the Sea-themed birthday party is the perfect way to bring that magic to life.

Credit: Lily’s Under the Sea themed Party by PartyDish Event Styling

Hi, ocean-loving moms! I know how exciting (and sometimes overwhelming) planning a birthday party can be. That’s why I’m here to help you create a celebration that’s equal parts fun, fabulous, and budget-friendly. From DIY decor ideas to mouthwatering themed snacks, we’ll cover everything you need for a party your little one will never forget. Plus, I’ll introduce you to free customizable Under the Sea invitation templates that are as beautiful as a coral reef (and will save you a ton of money). So, let’s grab our snorkels and swim right in!

Where Mermaids Gather

“Picking the Perfect Party Spot”

Every underwater adventure starts with the right setting. Whether you’re hosting in your backyard, living room, or a unique venue, your party’s location will set the stage for all the fun to come. For an outdoor party, a backyard can become a magical ocean escape with a few creative touches. Hang blue streamers to mimic waves, scatter inflatable sea creatures, and add a sandbox for treasure hunts. If you have access to a pool, it’s even better—turn it into a mermaid lagoon or a pirate’s lair with some floating props.

Credit: Under the Sea Backyard Birthday Party by Momo Party

However, if you’re hosting indoors, don’t worry! Transform your space with blue and green fabric draped along the walls to create a watery vibe. Add hanging jellyfish crafted from paper lanterns and streamers, and use fairy lights to mimic the sparkle of sunlight filtering through the waves. A bubble machine can add extra magic, turning your home into a true underwater wonderland.

Calling All Mermaids and Mates

“Free Under the Sea Invitations”

Invitations are like the seashell at the start of a conch-call—aka, the first peek your guests get into the magic you’re about to unleash. So why not kick things off with a splash? Sure, custom invites are gorgeous… but let’s be real, they can cost more than the actual cake (and I like cake). That’s why I’m seriously pumped to share these free Sea Animals And Mermaid birthday invitation templates. They’re cute, customizable, and won’t sink your budget—because let’s save the treasure for snacks and sparkly decor, am I right?

Explore the Designs

These templates? Yeah, they’re basically bursting with undersea aesthetic. One of them gives full mermaid-core vibes—flowy watercolor waves, seashells, coral, and a mermaid who looks like she’s about to drop her own beauty line. Another one’s got a cute little underwater cartoon scene with smiley fish, bubbly bubbles, and starfish just vibing—perfect for the tiny party animals.

Oh, and there’s even a treasure map-style invite that literally says “Dive into the Fun,” complete with a dotted trail leading to your party deets like X marks the cake. My personal fave? The one with the chillest little seahorse ever, just floating through a coral reef like he’s on vacation. It’s giving “elegant but still ready to party,” and honestly? It’s perfect for any age—toddlers, tweens, or even your dramatic 30-year-old cousin.

Why These Templates Are a Lifesaver

Custom invitations can cost anywhere from $50 to $150, and let’s be real, that’s money better spent on cake or decorations. These free templates save you time, stress, and cash while still looking professional and polished. They’re fully customizable, allowing you to easily add your child’s name, the party date, time, location, and even a cute tagline like, “Join Us Under the Sea!” or “Get Ready for a Splash-tastic Time!” You can even tweak the fonts and colors to perfectly match your party’s theme.

Once personalized, print them on cardstock for a high-quality look or send them digitally for a quick and eco-friendly option. For an extra-special touch, roll printed invitations into mini scrolls and tie them with twine, or add a sprinkle of glitter to the envelopes for a surprise your guests will adore.

CUSTOMIZE AND DOWNLOAD NOW ON CANVA!

Beginner’s Guides

Before you get too wrapped up in planning the rest of your party magic, let’s talk about invitations! Our free invitation templates are not only adorable, but they’re super easy to customize too. Whether you’re adding in party details like the date, time, and location or even a special note, you can personalize everything to fit your theme perfectly.

A. Download Instruction

Want to know how? Read this step-by-step guide to help you download and customize our free editable invitation templates:

Scroll up the page until you see the “Download Free Editable … Here” button.
A new page will be shown in seconds, and you will be able to see the preview of our template designs.
Choose/click the “Edit Template” button (blue button).
Now you can personalize our templates, like putting your son or daughter’s name, changing the font-size and color.
Once you finished with the editing, you can download the final draft (Go to File > Download > Select the File Type (PNG is the best option) > Download.

B. How to Print the file?

“Steps for printing our templates”

Save the image you want to print to the computer or to a flash drive if it is not saved already. (Step 5 of Download Instruction).
Go to the file explorer and find the file. Double click the image.
The file will open in Windows Photo Viewer
Go to print at the top and then go to the print option
Select the color printer if you want the photo to print in color
Select the print size you want
You may want to play around with the “Fit picture to frame” option. Sometimes that option will allow the photo to print closer to the border, but sometimes it will cut off the edges of the photo.
Hit print and Voila!!!

Looking for more ideas? We also have these for you, Need other ideas? Please show some love to these template designs, Purple & Pink Mermaid Skin, Little Mermaid and Mermaid Birthday Extravaganza birthday invitation templates. If you want to see other related theme and you want the freedom to personalize it on Adobe Photoshop, Canva or any Image/Photo editing apps, then you will love these:

Sea-worthy Snacks and a Show-stopping Cake

No party is complete without delicious food, and an Under the Sea theme offers endless opportunities for creative treats that are as fun to eat as they are to look at. Your cake is the centerpiece of your dessert table, so make it memorable! A tiered cake with ocean-blue frosting and fondant sea creatures is a showstopper, but you can also keep it simple with a single-layer cake decorated with edible seashells and pearl sprinkles. If you’re feeling extra creative, try a mermaid tail-shaped cake with shimmering edible scales.

Credit: Blue and Gold Under the Sea Cake by Simply Sweet Cupcakes

If you wanna keep things bite-sized and lowkey iconic, cupcakes are where it’s at. Frost those babies in ocean swirls—think blues, greens, maybe a little edible glitter if you’re feeling ✨fancy✨—and top ‘em off with fondant starfish or tiny sugar pearls like they just rolled outta an underwater bakery. Pro tip: stack them on a stand shaped like a treasure chest and boom—your dessert table just went from “cute” to photo op central. Like, someone call Pinterest, because it’s giving buried treasure but make it dessert.

Snacks That Wow

Let’s be real—kids will eat literally anything if you give it a fun name and put it in a cute container. So why not lean in and make your snack table look like it just washed up from Bikini Bottom? Turn your everyday snacks into full-on oceanic masterpieces. Serve Goldfish crackers in tiny sand buckets with a sign that says “Catch of the Day” (bonus points if you throw in a mini shovel for scooping—extra ✨aesthetic✨).

Credit: Under the Sea Snack Tray by Occasions by Shakira

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Slice up some watermelon and use cookie cutters to turn them into adorable fish shapes—suddenly it’s not just fruit, it’s a school of sweet, juicy sea creatures. And those veggie sticks you were worried no one would touch? Arrange them upright in a bowl with some broccoli florets at the bottom and boom: DIY coral reef. Add a little ranch dressing “seafoam” on the side and you’ve got a snack table that’s both Instagram-worthy and mom-approved.

Mermaid Art Time

Coloring Pages and Crafts That Spark Joy

Keeping the kids entertained is key to a successful party, and with an Under the Sea theme, the activities can be just as magical as the decor. A Coloring Page Station is a simple yet engaging way to bring the ocean theme to life. Set up a table with Under the Sea-themed coloring sheets featuring designs like dolphins, mermaids, turtles, and treasure chests. Provide an assortment of crayons, markers, and glitter pens to spark creativity.

Credit: Mermaid Coloring Pages Templates by Kids-n-fun

To make it extra fun, hold a mini art show by hanging up the finished creations for everyone to admire. For more hands-on fun, try a “Jellyfish Crafting Station” where kids can create their own jellyfish using paper plates, tissue paper, and googly eyes. Or, organize a treasure hunt with “clues” that lead to a chest filled with prizes like plastic gems, stickers, or bubbles.

A Magical Conclusion to Your Ocean Adventure

When the final wave of your Under the Sea party rolls in (along with the last sugar-hyped kid doing laps around your living room), you’ll know in your soul—you did that. From the mermaid-core decor to the sea-worthy snacks to the glitter-covered chaos of craft time, every detail came together like a perfectly synced dolphin pod. Magical? 100%. Exhausting? Also yes. But so, so worth it.

As your little one beams with pride—wearing frosting on their cheeks like war paint—and your guests leave raving about “the cutest party ever,” you’ll feel that inner mom glow™ kick in. The one that says, “I didn’t sleep, I ran on coffee and vibes, but dang it, I crushed this party.” And hey, maybe you’ve just inspired the next tiny underwater explorer to start planning their dream bash. If you hear a kid whisper, “I wanna be a seahorse next year,” just know—you’ve made waves.

FAQs:

1. What’s the best way to decorate for an Under the Sea party?

Use blue and green streamers, cutouts of sea creatures, and paper lanterns as bubbles. DIY decorations like a treasure chest or a mermaid grotto can add extra flair.

2. How do I make a sea-themed cake without professional skills?

Buy a plain frosted cake and decorate it with store-bought toppers like sugar seashells, edible pearls, or a plastic mermaid figurine. Cupcakes are another easy option—just add blue frosting and sprinkles.