...a Halloween nail art DIY, mayhaps? I'm thinking this would be perfect for a cake- or cupcake-themed costume.
The process is pretty straightforward, but here it is: you'll need nail glue, some tiny sprinkles, and some acetone (for taking it off later. it's a beast.) Paint the nail glue onto your nail, dip your finger in the sprinkles jar, remove, and voilà. You'll definitely need to touch up by removing some out-of-place sprinkles and filling in gaps with more sprinkles. I then "sealed" the sprinkles in place after by adding glue on top of the whole thing.
Also, please pardon my less-than-perfect, I-had-to-shoot-these-myself photos. (Such is life when your roommate is gone for a week!) And my unquenchably dry hands...#WelcomeToUtah.