I store my ungraded cards as singles in Ultra Pro holders.
I too am drawn to the artwork. Another cool thing about the 1951 Bowman Football set is that it wasn't just a re-cropped, re-issue of the previous years art the way that the Baseball set seems to have been. I would estimate that at least half of the artwork in the 1950 Baseball set was reissued the following year (Ted Williams, Warren Spahn, Casey Stengel, etc...).
The lead artist for the Gum Inc & Bowman sets (Baseball, Football, Non-sports) was a guy named Charles Steinbacher. Below is a link the the philly.com website about his family discovering some of the artwork that he produced for the George Moll Advertising Agency. Sorry it deals with mostly the Non-sports cards (I found it interesting though).
http://articles.philly.com/1993-09-2...l-war-war-news