I heard the other day that watercolor pens can be used on rice paper for logos. My question is: Can watercolor pens be used on foam? I think i have a set of these, but they dont look capable of coloring foam too well. A test run proved i was right… But i think i could mark up a board with them if i had to… Has anybody else tried these pens? Results? I believe my pen set is pretty cheap and old, so that may make a difference in results, any advice/comments appreciated