Used the Brick wall technique.
You basically stamp your image in black onto a piece of patterned (or plain) cardstock. Then cut the image up into pieces - I used 1 in x 1/2 in pieces - you want to stagger the cut lines, so that it turns out looking like bricks stacked. When you adhere to the card front, leave jagged edges on the sides.
If you want the full instructions, they can be found here SplitCoastStampers.
The majority of the materials used in this project are from ClubScrap. TFL DebDuzScrappin