For Halloween, draw faces on cups with a black Sharpie. Add vanilla pudding tinted with green food coloring. Crush some Oreo's to sprinkle on top of the pudding. Frankencups! Could also do orange for pumpkins, etc.
Crumple balls of newspaper wrapped in ducktape. Then add the white trash can bags (the ones you use in the kitchen trash cans) or cheap white sheets, now add a wooden dow and ribbon. or try your local Wallgreens for two dollars you can buy bag of 6 Ghost stakes and all you have to add is balls of paper.