So I'm a little late jumping on the bandwagon but at Scrapfest, I did a make and take using the Tim Holtz water pen and I really liked the fact that you could just use your distress or water-based inks. No need to buy additional items other then hmmm let's see.. watercolour paper and the water pen and of course, various colours of ink that you might "need".
So I've gotten together with a couple friends and we actually pulled out a few different supplies and experimented with them..
So then I broke down and bought a water colour set. LOL. I think I will just be using them for colouring images. I'm not inclined to make my own paper. This technique seems to be really fast and I'm all over that.
Worth checking out.