Write Something With A Fast Tempo!
As usual, there is no need to spend a ton of time on these projects. The idea is to think of the community challenge as your weekly sketchbook. If you're planning to write something that might take 5 to 10 hours, that likely means you'll NEVER participate. Think about writing a little something that takes you 5 to 10 minutes to come up with. It doesn't have to be a complete thought, it doesn't have to have a melody. It just has to be music.
The idea is to get into the habit of writing SOMETHING without putting too much pressure on yourself. Just try to have fun with it! When you've written something you like, you're welcome to record it as simply as possible - with a cell phone for example - or with recording software using drums, bass, guitar, etc. Whatever you have time for. If you feel that you never have time for the community challenges, you're putting too much pressure on yourself to be the most amazing musician.
When you've written something you like, feel free to post it on the community forum thread for this post!