Business cards
 

I was thinking of ordering my next batch of business cards with the end of a fifty or hundred dollar bill printed on the back. Anybody know what the legal issues (or if there are any) are regarding use of parts of American currency like this?

You can use parts. Just not a real serial number or an exact copy of the entire bill.

I have done that for my customers, as stated by powerpig as long as the whole thing isn't printed in actual size, everything is OK. :D

That's kind of what I thought, just wanted to make sure. Thanks.