Skyrim has some quite nice cave textures, and i have always thought that Oblivion caves look a bit boring. So i asked one of the Skyrim texture authors(CaBaL120) if i could import his textures here and he gave me a permission to do that.

These textures are from the mod: aMidianBorn Caves by CaBaL
http://skyrim.nexusmods.com/mods/39190/?

This replaces most of the cave related textures.

Installation:
Take a backup on your, "..Oblivion/data/textures/dungeons/caves" - directory before installing this.
Then uncompress the archive into to the ..Oblivion/data - directory overwriting the old textures.

If you have visual problems remember to do archive invalidation after installing the textures.