Rainbow Bubble Snakes - Need: Half a waterbottle, rubberband, bubbles (dishsoap/water), food coloring, sock. Steps: Dip sock held by a rubber band on the water bottle in food coloring in dish soap and food coloring and blow. Have fun!
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)