I just had my Led tails tinted dark but not black, its a rare color i was able to achieve and at first didnt like it because it doesnt match my red black and silver theme i have going but during the day you can have them on it looks good. I've already gotten a ton of compliments from strangers.

My engine bay is red and black too.
Let me know if you want pictures and i can help you.

People have achieved the look with painting but for it wasnt easy, i tried it. It was easier to just pay 20 dollars for the sticker, heat the areas up and stick, plus you can remove them any time you want.