Try to keep the paint close to the crease and away from the edges of the paper. Then fold the paper again and push the paint all around. I knew I wanted to cut these out, so the kids had to make sure all their blobs of paint got connected. If they opened the paper up and noticed "floating blobs" they just closed the paper and pushed some more. When everything is connected, it will look like, well, anything. But in our case, it looked like a monster!
Then I put out glue and wiggle eyes and the kids could add those anywhere on the paint.