Everyone needs image textures. There's no other way to realistically texture your objects in Blender. There are many sites you can go to to get textures such as CG Textures, Texture Warehouse, 2Textured and much more. But I find it very useful to build up your own library of textures. My texture folder has textures i've collected from some of those websites, tutorials, my own camera and texture packs available at some Blender sites.
