I made this under the sea cake for a teacher appreciation week with this theme. I took a lot of ideas off this site and just free handed it.
The cake was just a mix in a 9×13 pan. I used ready made frosting, and did the sand first, its the stuff from the bottom of a lucky charms box (minus the marshmallows). The large chocolates I made with Wilton molds (very easy) and I filled in with gummy fish and octopus.
The schooling fish were sprinkles I just poured into my hand and placed individually so they were all going in the right direction. The seashells in the left corner were from the grocery store, I found them in the bulk section. the coral/sea grass were Twizzlers I cut following the twist. The lobster are mini red M&M’s with 2 white sprinklers laid by hand.
It honestly took me less than 30 minutes to do. The hardest part was keeping my husband & son from eating all the decorations as I had put them all out on the counter.