Every man needs a place to call his own. While most guys are willing to let the lady of the house decorated most of the living spaces, the man cave is a fuss-free environment where sports memorabilia, half-finished projects, giant TVs and plenty of drinks live in harmony. Your DIY Man Cave is really about bringing out your personal style, so consider starting with a theme that you can use to set the tone of the room. From there, you can add decor items that amplify the theme.