With the help of a photographer from Groupon and VistaPrint we were able to make our own thank you cards for probably cheaper than buying the pre-made ones.
You could use this same idea of holding papers for birthday parties, announcements, Christmas Cards, etc. Enjoy!
We used the space on the inside left to write a personal note, and the right side had our names signed as pictured.
(oh, and if you're wondering why Dave has a goofy look on his face, it's because the out-takes were so much better than the cheesy grins and we chose to use them)