-A salad spinner that looks like this:
(It needs to have the handle that allows you to spin it, not the pump version.)
-Small paper plates that will fit inside. I used dessert sized.
-red and green paint
-cellophane or plastic wrap
-Place the paint in the spinner.
-Help children drop small blobs of red and green paint all over the paint. Make sure you get some near the middle.
-Place the lid on and have the children use the handle to spin the plate inside.
-After the plates are dry, wrap each in plastic wrap and secure with tape on the back. I also tide the excess wrap on each side with a little red yarn to keep it in place. (My assistant and I did the the wrapping and tying part, but you could have older kids do that part on their own.