When I did this in the Sunday Skirmish themed Bicycle a couple of weeks ago. It had no melody, just the beat. We pictured a bike with no rider. Now it's all grown up with a melody and other fixin's.
Oh, I might as well post mine here! I had a hard time getting creative this summer and only managed to get a rough version of one song up in the last week of September-- but people had to go to what was probably an unfamiliar and somewhat confusing site in order to listen to it. Now the final mix is up on Soundcloud, which makes it a lot easier. This is an instrumental called "Nightdrive". https://fiftyninety.fawm.org/songs/11441