I just had to make a card using one of the new Poppystamp die, the stained glass window. There are a few different designs, but my favorite was this one. I used vellum and temporarily taped down the die cut image, so I could follow the lines. I colored it from the back (very important), with COPICs. I'm sure there are several other coloring tools that would work too, but my COPICs are always handy.
Then I added permanent adhesive to put down the first die cut shape of a copper card stock. I was originally going to leave it like that, but after die cutting black to go behind it (thanks Lee), I placed the black image just off center of the copper a bit. This effect made it look like a shadow and really popped the stained glass look.