I have just reinstalled my Oblivion again and atm I'm loading it up with a bunch of mods. But I just think vanilla Oblivion is a bit too bright and colorful for my tast. So I ask the dear community, are there any mods which change the atmosphere to a bit more darker and gothic feeling?

PS, what's up with the ATI HD5770 shadows greyed out? I can't check the shadows on grass and shadow quality thingys in the option menu. And yes I have clicked on "ultra high settings" when I started up the game for the first time

cheers!