Here's a fun one I did a while back. I took copper sheeting and nailed it to a 1x8 piece of oak. The copper is so soft that I just wrapped it around the edges almost like wrapping canvas. Then I took a scouring pad and went to town on it, roughing up the surface so the paint would adhere, and distressed the edges, pounding it with a hammer. I laid flake white down for the "paper", clouding it out as I went up. The technical drawing is a helicopter part, and then I placed the Lily over, going past the paper into the cloudy part to emphasize the natural/organic.