The writers over at TSTO Addicts are hosting a contest for Halloween. To get the full details on the contest please visit their site. From what I could ascertain, the general premises seems to be to create 2D artwork using the various decorations available in the game. The winners will receive either iTunes or Play Store gift cards which can be (but do not necessarily have to be) spent on donuts.
If you have the in-game cash and free space to use as your canvas, this contest could be for you.