
After reading a bit further today, I realize that he starts with a few layers of wet paint before he sets the rock down in it. I started mine with just setting the rock down, then dribbling paint and ink over it. In any case, I like the ones I made and plan to keep playing with this cause I love the effect.

The first one was done with Moon Shadow Mist in Tawny Turquoise. It's gorgeous in person. I bought 4 colors of their spray inks a couple years ago and haven't used them much but will try the other three with more fossils.
The others are mostly Dyelusions inks and Distress Stains. I didn't do any with watercolors like David does them but will give that a try next.
This is an easy an interesting thing to try. All you need is some heavy paper, a few flat-bottomed rocks, and liquid color of some sort - watercolors, inks, fluid acrylics.

Think I'll cut some postcard sized paper and get some started...