For the 2012 NFL season, the league will be switching over from Reebok to Nike as the official uniform supplier/designers for the 32 NFL teams. I don’t know how legit these concepts are, but here are all sorts of uniform concepts/suggestions for each of the NFL teams from a user named Lil Phil on Flickr.
AFC East
National Football Conference (NFC)
Full Set of Photo Concepts
What I like about all of the uniforms is that there is a similar style or motif to each of the uniform designs, while still keeping the distinct and unique attributes of each of the team brands.