I hope my nephews don't read my blog - pretty sure they don't!
I think whoever came up with the idea of gift cards should have a holiday named for them!
Here are the wallet cards I made for my nephew's gift cards. They are held shut with a little square of velcro. You could slip bills in the back pocket (well, I can't because I glued down the middle but if you left it open you could). I actually stitched the 2 pockets together on my sewing machine. I've got to do more sewing in my scrapping...since I'm not using it for clothes!
Have a Merry Christmas. Susan