I manage to put a picture behind the desktop picture, how do i change or put bake the color?

How do i change it back to the grey color?

Find out from your son how he did it and roll it back.  Without some plist manual editing or via other 3rd party tools, that graphic cannot be changed.  Your easy path for fixing this is to simply ask your son in a non-confrontational way... and you will even learn something he knows and you do not.  I know there's some tools out there that can do this, but I haven't done the legwork to dig them up, much less a trustworthy one.  Chances are good he read something on how to hack that on the system and made the change.  All you have to do is gain access to that same knowledge and presto, problem solved.
No, him saying "I don't know how it happened" is NOT an acceptable answer.  He'd only give you that answer if he has a reason to be scared of you or any ramifications if he fesses up.  Not trying to tell you how to parent, but if you can get that fear out of his mind, he'll tell you what he did and whatnot.  Hey, maybe approach it from the standpoing of... "Hey, that's cool, didn't know it could be done even if it's hacked like that, it would be nice to change it back or put another picture on there, etc."  That should defuse his fear...  Good luck and sorry I don't have a direct answer for you aside from this suggestion.  If I stumble across some docs on how to do this, I'll post it on here.

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