A pool party, beach party, or luau party are some of the most popular ideas for birthday party, so it stands to reason that there are lots of cute birthday cake ideas for an under the sea or underwater cake.
The underwater cake examples shown here could be used anytime you want a underwater or beach cake for any of those themes.
It would also work for someone who loves the ocean, marine life, or as a scuba diving cake.
Or you could go with boat cake or pirate cake.
Show us your great birthday cake and tell us how you did it!