I chose the theme of 'Numbers' for my 'N' ATC. The background paper is from a big case of paper which I bought at Costco a couple of years ago. I used a Tim Holtz stamp and black ink to stamp the numbers onto it and then inked the edges.
The blue numbers are die cut using Mac 'n' Cheese dies. I actually cut several of the 2 and stuck them on top of each other. The ATC is finished with two pieces of black Card Candy from Craftwork Cards.