Art and Cool artists - just a few of my favorites.
J. Wayshak. Brilliant artist, really high on my fav. artists list.
Bobo the Seal's site. Very good 2d/3d artist.
Kevin Llewellyn - great pencil drawings and paintings.
Justin Cherry - good art and an interesting site design to boot.
Lee Ballard - paintings and drawings.
Steve Wolfhard - Very interesting semi-cartoony style.
Name says it all: Silly Pink Bunnies.
Scott Thigpen - interesting illustrations.
Either photosource for textures, or handmade texture depositories are listed here.
Good reference material. Mostly pictures of odd things.
Classic ruins. Great photographs of all sorts of ruins.
Japanese picture gallery.
Found pictures (after hurricanes and whatnot) + silly stories.
Stock pictures of all kinds of things.