More cards. The upper left was done by marbling on shaving cream. It's a fun technique where you make a layer of shaving cream, drop paint on it, use a skewer to move it into a pattern, and then make a print by putting the paper on it. Remove and let dry, then scape the cream off.
The lower left has a piece of paste paper. Paint is thickened with a special paste then applied to the paper. While it is still wet, it is drawn into leaving a pattern.
Thanks for all the comments on my green piece. I'll probably try cutting it into cards.