Bottle Bank via Martha Stewart: transform a used plastic bottle into a cute piggy bank. Could use same idea to made little containers for kids to store their collections too (use bottle with wider opening and don't make slot)
Use milk bottles for pencil storage Recycle plastic milk bottles in to pencil holders. Grab a craft knife and recycle your large plastic milk bottles in to pencil holders. Extra points if you go all OCD and file them by colour.