These are my favourites, for The Hobbit, although it took me a while to make sense of the site and work out who the illustrator is. Peter Green. I think I just love plain pen hatched drawings.
Some more black and white The Hobbit illustrations, by David Wyatt. Maybe I just like the composition.
After digging around a bit more, here's a colour Wyatt illustrations.
Very, very different (aside from the circles) but hey, it's got ents. I need to draw some ents. This is a particularly good ent, by Rodney Matthews.