Oh, but what about? You say. What about them? If they are right, do them. If they are wrong, don't. What makes a thing gray? Sometimes it's a cultural matter: what a person in one culture would consider sin a person in another culture wouldn't. Well, what does the Word say about it? Sometimes it's an individual matter--"I don't feel comfortable doing something" or "I don't want to offend anyone doing something." Well, if you only keep from doing something to keep from offending someone, what injury comes from their offense?
The devil is in the details. Let's take tattoos. I don't get them, but are they wrong? They either are or aren't. If they are wrong, we need repentance. If they aren't, go for it. Maybe we all need one.
Ok, this is my attempt at irony a la "A Modest Proposal." There just aren't as many gray areas as we like to think. Too much of this discussion is based on personal preference rather than a study of the Word.