From shimmering mermaid lagoons to playful Baby Shark parties, ocean themes cover every age. Party trend writers note the ocean explorer theme has become one of the most popular of 2026, helped by its photogenic colours.
Three ways to do it
- Mermaid lagoon: pastel scales, shells and pearls, a shell throne. See mermaid.
- Ocean explorer: a coral reef, sea turtles, octopuses, a submarine. Great for mixed groups.
- Little ones’ sea: bright, friendly fish and Baby Shark for toddlers
Our sea shell and pool party themes are lovely summer variations.
The look
Layer blues and teals with coral, lilac and pearl white. Add movement with fabric waves and hanging jellyfish. A soft blue glow transforms a hall into an underwater world.
Activities
- Mermaid tail or crown decorating
- Sea-creature treasure hunt
- Fishing game with magnetic rods
- Bubble station (perfect for toddlers)
- Shell painting
Food
Goldfish crackers, seaweed-green jelly, “fish and chips” for kids, mermaid-tail cupcakes and a blue ocean drink. Simple and fun.
Return gifts
Shell craft kits, sea-creature puzzles, personalised beach towels or ocean storybooks.
Quick answers
Is a mermaid party only for girls?
No. An ocean explorer version with sea creatures and submarines suits everyone.
What colours suit an under the sea party?
Blues and teals with coral, lilac and pearl white.
What is a good under the sea activity for toddlers?
A bubble station and a simple fishing game are perfect for little ones.
