Do you have any falling leaves at the moment? I remember as a kid we used to do leaf paintings, just cover the leaf in paint and press it onto paper and it leaves the cool veiny effect.

Today at playgroup we made kites (I use the word very loosely..lol) using paper bags with holes punched at one end, and some of the curly ribbon, or you could just use string, tied onto the holes. Then paint or stick stuff onto the bags with glue, and glue some streamers to the bottom.