[Melusine]

If you are playing evil, you wouldn't have any qualms about stealing either, right? So you could go into a shop that doesn't sell any good items or which you won't visit anymore anyway, and steal with a lousy pickpocket ability. When you get caught, you lose reputation points.

Quest spoilers:
'
'
'
'
'
'
'
You could do this for example in the Brynnlaw store just before you leave the Island or with the storekeep in Maevar's Guildhall just before you get the order to kill MaeVar.
Also, in the Graveyard buried alive-quest, you can take the evil path by picking up the ransom yourself (also gets you a nice item for if you have TOB)