I came up with this for “monster hands” last year when trying to think of creative Halloween snack to make with some “Twinkie” snack cakes I had.
On a tray or cake board, make 2 stacks of 2 or 3 cookies. Place the snack cakes around the large cookies like fingers on a hand. Use the 2 halves for the thumbs. Take a bag of icing and make little dollops on the “fingers” and main hand and stick M&M’s in the dollops. You don’t have to do this, but I thought it made a more “monster-ish” look (and adds yumminess :-)). And that’s it. Pretty simple.