Just a thought… ;o)
Now that this should be a cover with Man. Utd. only - you could have gone "all-in" and put screen-dumps with Man. Utd. players on the back instead of the brazilian national team.
Honestly though - great work mate! I work as a graphic artist designer (or what it's called i english - I'm from Denmark - where it's called something else…).
I'll be getting my brand new iMac soon for my home - so then I'll hopefully have some time to play around with something like that. (But with a wife and a one year old daughter, I won't put my hopes too high! ;o)
Need inspiration - check this one out:
http://www.oleole.com/mediasearch/wallpapers
Have a look around - there are loads of great wallpapers!
Keep up the good work!
[EDIT: Just jumped on my own link there. It's been some time since my last visit there - and back then, there was only soccer-wallpapers. Weeeelll… look's like that isn't the case anymore. So I just wanted to state, that I was only trying to link to a page containing soccer stuff - and not the rest of the stuff on there.]