If you can be creative collaboratively, I also recommend setting up a weekly time to meet with a friend to jam or otherwise work together on a creative project. This is a great way for some people get the creative juices flowing, and you might be less likely to break an engagement with someone else.
In a sense, it's like exercise. It's been years since I've run on a regular basis, and I don't doubt it is related to the fact that I don't have a running buddy. Running seems to be much more fun when you have somebody to do it with.