I wondered if you could use water soluble makers to color the stamps too.... So I gave it a try! These are just some washable markers from your local dollar store.
I hope I'm not making anyone cringe with my bad stamping! Haha ; )
I found that I really needed to add a lot of water to get the marker ink to behave like watercolor. It still wasn't as nice as if I had used watercolors, I think. But, it's fun! : )