The Internet has evolved some unique opportunities for creativity and venues for building community. Or you can be creative and build community all at the same time. You can spend WAAAAY too much time investigating and perusing all that's available. But do take some time to give these great sites at least a look-see.
Photo Friday announces a weekly theme and hundreds of folks submit photographs. Always fun and sometimes astonishing.
Not to be outdone, Illustration Friday announces a theme and artists post drawings. Another jump-start to the creative juices.
Claire Robertson, a young Australian mom and illustrator who maintains a wonderful blog called Loobylu, has begun A Month of Softies at her site. She suggests a loose theme and participants make three-dimensional figures--dolls, stuffed toys, etc. The idea is that the items be sold for charity, but it would be awfully difficult to part with some of these very fun works of art.