WTF that just killed my RAM!!!1 Please resize ur picture!!1!!111!
The plain look is alright. But the font ruins it. For something real simple, use like Arial or something like that. There's a really good free san-serif that's called svenington or something like that, that would work good.
I ain't a great fan of RadioHead, purely because I've never had any desire to listen to any of their stuff. I'm sure they're great though.
As for the Wallpaper, I like it, I don't like wallpaper's that are too busy and I think this one works really well. 10/10.