I had fun with this idea and am growing quite the collection of ways to test products!

This was my first attempt:I realized after the fact that Denise was putting a larger piece of paper down when going to the edge...so I made a bit of a mess.  I also really don't like the way paints work on this particular journal paper.  

This one, I changed up the red and yellow colors.

Then, I went way different colors with the gouache

And finally, water color...