Superman tattoos can be really cool. I have seen so many nice ones in the past. Everything from just the famous logo "S", to full body shots of Superman flying. In color it looks great but can be pulled off in black and grey as well. A timeless character that will always be popular.
Many people love the Christmas season so much that they get tattoos inspired by the holiday. I have seen everything from Santa, snow, The Grinch and more. Men and woman have gotten these awesome tattoos. Just try and be original. Get a good artist to do it.