Good to know iam not alone with this. Perhaps we should try to narrow the problem down.
I edited my .ini files mostly according to this thread
Spoiler http://www.neogaf.com/forum/showthread.php?t=451616
however, i changed back to my backup .ini′s after the models color changed to red but the problem still persists. I used nvidiainspector to change my settings according to the neogaf thread and changing everything back to default didnt help either. The last thing i did which btw greatly boosted my performance of the game was to allow the Skyrim.exe to use more ram with Large Address Aware. That is all i can think of what i did before the model colors changed.
btw iam on a Phenom 2 x4 955BE @3,5Ghz, Win7 64bit, Gtx580 Twin Frozr 2 with latest WHQL cause the new beta driver made Skyrims performance very [censored] for me.