Gorilla black locking lug nuts FTW. You can get a full set of 20 for something like $75?
i don't recall just where I bought mine. I had a set of black ones on my 2011, and now I have a set of chrome ones on my 2013 ZL1 to match the polished wheels on it.
I prefer the full set of 20 so all the lug nuts look the same.