Somewhere at one time I had a photo, time lapse, of a boat moving on a lake. In the photo you see the bow and stern lights, (red/green and white) but not the boat nor the wake. Just the light trail coming in to shore.
Star trails seem to work well for me if I put the north star center frame then time lapse an hour or so, everything stretches around the fixed point in the middle and the longer the exposure you get more coloured stars, not just the white you see with the naked eye. Pretty cool stuff.