Projects I've done: 1st Grade: I found this one online (Sorry to whomever I took the idea from, I cannot remember where to post credit!!). Each student traced and watercolored their hands (both for a smaller class). Myself and another mom painted the canvas, sealed the hands with a spray fixative, placed the handprints around the edges with decoupage, then put on two coats of decoupage over the entire thing. Canvas is about 3'x4'. It now hangs in our school office. :)
a short lesson on Impressionism through the book, Ish, by Peter Reynolds Fine Lines: 1st Grade art lessons - several on this blog. This one is with watercolors; using qtips and fingerprints for flowers.