It's very cool to have a tattoo, but it depends on what kind of design you choose. There are people who have body symbols or drawings to represent something from their life. Some people choose to cover their entire body with tattoo, including their face.
Besides reaching the decision to have a tattoo at all, the next big decision is what design to choose. Tattoos can look really cool, provided a lot of thought has gone into choosing your design, and based clearly on the understanding that this is a permanent marking on your body. Removal is expensive, painful and not always effective; thus, it's best to make the right choice from the outset, to avoid tears and regrets later.