Here is a pop up gift card that I recently made after seeing a tutorial on pinterest. (LOVE pinterest, don't you?)
I used the Chantilly paper pack from Close To My Heart and the sentiment was stamped with Just a Number D1514 from Close To My Heart.
Here are the directions that I found for the pop up card. It's much easier than it looks. It would even be great for making in bulk to have enough on hand for the last minute gift.