I found this very cool art piece from Dilly-Dali Art. They sprayed their hands with white paint onto black paper and it looked awesome! So I tried that with my kids today. Although I loved the look of having a bunch of hands on one big sheet of paper, I also wanted each of them to have their own to take home. So I put white paint in a spray bottle and added a little water. Then the kids took turns spraying each other's hands on black paper.
When they took their hands away, they loved what was left behind (not to mention how cool their splattered arms and hands looked!).
I put them up really close together so it looked like one big art piece.
My only disappointment with this is that I think I added too much water. Or maybe construction paper absorbs too much. I just wish the white was whiter, you know? But it still looks cool!