Create tin-foil sculptures in two minutes or less with large or small groups of kids. Each child should be given his own roll of aluminum foil and the same prompt of what to sculpt. Allow everyone one minute to visualize and plan how they intend to create their sculpture, then start the clock, with everyone creating their sculptures at once. At the end of two minutes, compare the finished (or unfinished) sculptures and discuss what worked and what did not. Move on to a new sculpture or repeat the same prompt to see if it can be improved upon.
Use a home salad spinner to create dazzling spin-art paintings. Cut out paper "canvases" to fit snugly inside the bottom of the spinner bowl and pour small amounts of various colored paints in the center. Cover the spinner and turn it on high for 10 to 30 seconds. Remove the top and view the end result: multi colored forms, jutting out in streaks at all angles. Lay the finished piece out to dry and begin again. Commercial spin-art machines can be purchased at toy and art stores, but they are typically more expensive than a traditional salad spinner.
Create your own symmetrical Rorshach designs by folding a piece of paper evenly in half, creasing it, and opening it again. Dab black ink across the inside of the page and quickly fold it together again. After holding the paper tightly together for a few moments, open it back up and allow it to dry. The end result should be a symmetrical design on both sides of the paper.
Tie a long string around the inside of a bagel and coat the bagel with a thin layer of peanut butter. Cover the peanut butter in birdseed and tie the string to a branch on a nearby tree. You have just created a tasty meal that birds are guaranteed to flock to.