What textures do you reccomend to make the world look more muddy and dirty? The world is too clean, I want it to have a more gritty/medieval look, any ideas?

Check out some of http://www.nexusmods.com/oblivion/users/1600249/?tb=mods&pUp=1

Overall, Oblivion's color palette can also be held responsible for how you think the world feels. Maybe try an http://www.nexusmods.com/oblivion/mods/44542/?tab=3&selected_game=101&navtag=http%3A%2F%2Fwww.nexusmods.com%2Foblivion%2Fajax%2Fmodimages%2F%3Fid%3D44542%26user%3D1%26gid%3D101&pUp=1