Someday I want to coat my whole arm in icing and dip it in a vat of sprinkles. I wouldn't know what to do next, sadly, once I'm thoroughly spackled with hardening icing and sugary bits. I wouldn't want to eat it, I just want to take pictures of it maybe and call myself "Ol' Donut Arm". I guess just a donut will do.
Personally I prefer my marshmallows toasted and gooey, but I know a lot of people like them firm and right out of the bag. Why not dress them up a little? Everyone appreciates a little fashion forward thinking from their snacks.
Normally I'd scream overkill at a cake this busy but there is some amazing balance going on here. A striped rainbow heart inside a striped rainbow cake? A rainbow of fondant sprinkles so perfect they must have been placed there by very patient elves? I swoon for this kind of overkill.