Allow “author” or “editor” to change theme?

I’m administering a blog for someone, and he’s just computer literate enough that I’d like for him to be able to change his theme (from themes uploaded by me) from Admin, but I think he’d be a bit overwhelmed with the rest of the Admin functions if I elevate his user level that far.

Anyone know of any hacks, plugins, etc., or am I going to have to figure this out on my own? (I’ll share, I promise = ) )

Thanks,

Tommy George