While many are trying to kick old habits or shed holiday pounds, I offer you a different challenge: pick up a habit. While I wouldn't encourage smoking or competitive eating, there are a lot of positive addictions out there. As Paul Graham points out, addiction can serve as another word for something we like too much.
You can always make time for the things you truly love. The things you spend your time on reveal a lot about what you prefer. Probably more so than the things you say, "I wish had time for...." So do it. Think of something you've always wanted to do. Sit down and figure out how an hour or two per day for a month can get you closer to that goal.
For further motivation, here is Google's Matt Cuts encouraging you to expand your horizons for thirty days:>