Fun skewer dying trick from here: rock-ur-party.tab...
Painted wood scraps, and $5 frames from WalMart! WOW!! Have I got a use for my wood scraps now!
Homemade Ice packs: 1 part rubbing alcohol to 3 parts water. Gets really cold, but never hardens so you can manipulate it.
giant ker-plunk and several more DIY games