Found these sites around and they are excellent for doing manips. This one has just about everything, portaits, materials, landscapes, its awesome. www.sxc.hu This one is a basic textures such as asphalt, ice, leaves, brick walls, very useful for making face textures. Noir Textures Post some others up here if you got em also
First one is a stock site. Not the greatest to find manip images because They are all really small. Unless you want to register and I don't. Good texture site though.