The mother of my daughter's friend had an extra, brand new 4 Gig iPod with a pink metallic case to sell (dirt cheap, mind you), and asked if I wanted it. Well, since I had a no-name, basic MP3 player with only 512 MB of memory, I took her up on her offer.
But instead of just giving her the money, I wanted to thank her properly too. So I made a 3D card in the shape of an iPod (scored and folded lines to make a "box" with the top open). I slid a folded card inside with my sentiments, stamped it, added an eyelet and cord to resemble the white headphone cord. When you pull on the cord, the interior card slides out to reveal the money tucked inside.