I can't tell you how much fun I've had with this technique! It all begins with something like this, where I lay down some thick wet lines and let it dry completely. Next, I slather on a buncho paint on another blank sheet of watercolor paper. Then, BLAMO, I put the dry on top of the wet and apply pressure. With these two, I applied A LOT of pressure, squeezing as much of the excess paint out from between them as I could. I made a big mess but it was TOTALLY worth it! Not to mention pretty damn exciting as well : D
You know, in a lot of ways I like being a mostly untrained artist. I mean, discovering things like this on my own makes it all the more special to me. Enjoy!