I've lost my workout motivation. HELP!!!

Anne
So all this snow just has me downright depressed. My husband and I have a 24 hour gym membership, but for the past week and a half now I have fought against going to the gym. I can't muster the energy after work to do more work. I just want to sit and veg and have the pounds melt away (don't we all?). I've never been good with keeping at going to the gym....
What keeps everyone else motivated to work out when experiencing the winter blues?