Out of all the rainbow cakes I’ve stumbled across, this one should get an award!! Megan managed to make the colorful cake batter look just like the arch of a rainbow. Not only that, this cake has a surprise leprechaun trap located in the center of the cake underneath all of those chocolate coins! How fun is that!? She has even built a cute little ladder out of pretzels to lure them in. For the recipe and detailed instructions, hop on over to Not Martha and let Megan show you how!