I have quite a few LOTR desktops - finding and making them has become a sort of hobby of mine. (Boring, I know...) For a long time I had the Ted Nansmith painting of Luthien dancing, and the Alan Lee one of Rivendell.
But I change them all the time...
I made some LOTR ones one time... they're all from the movies, but you can see them
here . I also found a couple sites (that I forget the addresses to

) that have a terrific selection of Tolkien art... John Howe, Alan Lee, and Ted Nansmith are only a few of them...
~Elrowen