Plastic Wrap—Who Knew?

I watered down some green paint, poured it over a piece of paper, scrunched plastic wrap and smushed it down onto the paper between two pieces of wood.  After that dried, I repeated the process with watered down blue paint.  I was extremely pleased with the result.
I then drew on the paper, resulting in this drawing:

Untitled
8" x 12"
Acrylic and pen on paper