I picked up a couple of packages of plain white plastic eggs from Hobby Lobby, and drew green spots on them with a permanent marker. I filled them with chocolate coins, and toy plastic coins.
|Yoshi egg, for our Super Mario party.|
(Technically I took a few creative liberties with the game. Although both Yoshi eggs and coins are present in the Mario games, you don't get coins for finding the eggs. L, who's a stickler for technicalities was quick to point this out to me, but I don't think most other kids will notice.)