I really love this masking technique with watercolor paints! I've been using this stamp set from Crafter's Companion for a lot of cards lately. It's just so clean and simple.
I stamped the daisies on watercolor paper and then painted over them with a liquid masking product. When the masking was dry, I did a vibrant color wash. After the paint dried, I peeled off the masking. The results are STUNNING!
The entire panel is mounted on a white card base with foam adhesive.