So, I looked around to see what I had to use...and found a couple frames I recently picked up at Goodwill. I popped the stamps in the boxed plastic frame and holy shit, it looked awesome. The repetition of the Elvis faces channelled Warhol's Marilyn prints. Encased in the acrylic frame, the look became very modern.
What I'm trying to say here is if you want some cheap pop art, you can make it yourself with some stamps and a modern frame. :)