Two small retexture .pak's that I made last year that change the look of the DM maps and some others. They contain .tga and .png files so you need to run a q2 client that can handle those formats.
(Note: if you don't play much on the standard DM servers the texpak might not be for you since it doesn't completely retexture the singleplayer maps but will affect some of the used textures.)