I also really like the first Healy one, looks really cool and like on the second one i really like the simplisity of the wall, great wall mate, cant fault it really.
Love the Healy second one,looks really good. I like the simplisity in it, looks simple, but really really well done. Love what you`ve done with the bg and the render looks also great.
The Ronaldinho ones look also really nice, i think the second version is better, i like the bg, but i dont like the text and the render. The text looks original (where you have put it) but i think you should change the font or maybe find it an even better place. I dont like the render effects, i think they dont fit well with all the other stuff.
IMO the Healy wall (the first one) is the best from all 4 walls and thats why its my new desktop :p