This could be a fun way to create Calder acrobats! Swing From An Empty Shoe Box Project For Kids - by Krokotak - == - By Russian educative website Krokotak, here is a cool project for kids, with a tutorial full of photos that dispenses words.
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!