I give you my very first cover, and my very first attempt to recreate an original box, and my very first post to this forum.
NES Play Action Football.
I used Shenske's NES template, and the original box art submission to The Cover Project, then went through and did what I could to clean up the original boxes bends out of the front cover and clean up the logos, as well as fully recreate the back.
While not 100% to the original, I tried to keep it as close to original as possible. The "logo" on the back was traced in Illustrator and redone so that it would look more crisp, and I kept the original screenshots as they were ok and I didn't feel like replaying the game in an emulator to get a proper screenshot. Like I said, not 100%, but still pretty close.
Since I started working on this, I noticed someone else also posted one in the Shenske format, but it's not as high res as this one, so I thought I'd give it to you all.
View:

Download:
http://www.mediafire.com/download/bebnyr2mda8cre7/nes_nesplayactionfootball_lashek.jpg