Here's the final two cards for my "found object" workshop.
This one uses bubble wrap for the background. I just inked up a piece of bubble wrap slightly bigger than my paper and pressed it onto the paper. I did Moonstruck on Moonstruck, but it looks great on white too. I used watercolor pencils and a waterbrush for the image.
This one I used the drywall tape for the background. I covered the white piece with tape and brayered Crystal Blue over the top. Then I removed the tape to get the design. The flower and center are pop-dotted. It's hard to tell in the image.