Dawn Griffith had a card on her SU blog that inspired me to make these. I used SU cardstock, Growing Green stamp, Memento Ink, some hot fix rounds and Promarkers to shade the stamped image.
After doing a couple with plain rectangles, I used a Fiskars corner punch to dress up the corners a little. The image is stamped on a light grey cardstock but it appears white in the photos. It's stamped in black ink and shaded with a light grey Promarker.