Kudos to you for taking the time to cut out the players from all those photos... that takes a LOT of time (at least if doing a quality job). As far as honest opinion regarding the background itself, it's very busy and cluttered, which makes for bad desktop backgrounds (IMO) because it makes it hard to see icons, and is hard on the eyes in general. I like the idea though.
"You can hurry up all you want. But if you can't get yards and can't complete passes, then it's just quick three-and-outs." -- Richard Sherman