Glue and food coloring...mix it together and use like paint. Be very careful if using water to rinse out brushes, water will change the effect of the glue.
Keaton was more interested in painting the paper:-)
Finished products....since Keaton only used one color and didn't rinse his brush the run effect from the water is not on his like the other two. I thought they turned out great!! They boys are already busy collecting money.