Here is a simple yet effective technique using two different colors of cardstock and ink for a "positive/negative" look.

We used black and white, but you can use any two colors you wish. We stamped the image on white paper using black ink, and then stamped the same image on black paper using white ink.

These were both then embossed.

Next, we took the black paper and cut it in half on a diagonal and lined it up on top of the white paper so the images matched (you can use a Stamp-a-ma-Jig if you wish while stamping to make sure the images line up exactly).

If needed, you can trim the edges of the rectangle so they are straight, then all you need to do is mount this onto a card and decorate and embellish any way you want.

The leftover triangle shape can be used for yet another card as well!

Happy Stamping!

Lizz