There is a tradition in the Catholic church of giving something up for Lent. As I mentioned in a post last year, I don't expect giving things up for Lent to get me into Heaven but I'm pretty sure it can't hurt either.
Last year several other people (including fellow blogger Aisha) and I decided to give up unnecessary shopping during Lent (3/1 - 4/15). We called our group NUNS for No Unnecessary Needless Shopping.
Feel free to join us. It's harder than it sounds.