Blech.
I just tried my hand at the Amy Butler Business Card Wallet Pattern. This is a free pattern which you can download from her site. I don't like it. You can try it, but I'm just saying, not very cool and the results are less than awesome. I'm always looking for awesome, as you know.
I found it to be fidgety, too small, and unnecessarily complicated. I also found the pocket design was lame and will probably result in cards falling out. It also adds a lot of bulk to the middle of the wallet where it folds. I did skip the step that instructs using a copious amount of interfacing for such a small little wallet. Maybe that's why I hate it.
But when I started to see where the pattern was going, I didn't want to waste precious timtex or interfacing on it -- that stuff is so unnecessarily expensive, as you know.
If you have a bunch of small scraps and you're looking for something small to make, you might as well try this. But for that size of project I actually recommend the Lotta Jansdotter checkbook cover or tool roll, or the Joelle Hoverson bird ornament. Those are little and cute and fairly easy. Good luck.