Aluminum foil and sharpies! Sometimes the best result comes from the simplest medium.especially with kids --------------- this was not actually done with a roll of "aluminum foil" but with heavier aluminum; such as pie pans cut up - still really cool
Take a 2 liter soda bottle, poke holes in it. Attach to a garden hose. Toss over a tree branch and let hang for a kids water sprinkler. You can loop it over a tree branch and let kids bat it around for more watery fun!