When I got my CWP (in South Carolina), the instructor told us that if we have to use deadly force we will be sued by someone. Using the same ammo as law enforcement is easily defensible (remember the quote "I figured that it was good if the police use it.") The same thing for items like Crimson Trace grips ("I got them because the ad said that if someone attacked me and saw the laser they might run and I would not have to shoot them.") However, something like grips with a grim reaper or a skull and crossbones on them could be used against you in a civil suit. Like it or not that's the reality of the situation. They certainly wouldn't guarantee that you would lose the suit but they wouldn't help at all.
That said, if you put something like the crest to your old (or current) military unit, an American flag, your favorite football team or something like that you would probably be fine.