Digital Photography School had this on a post last week, it may be inspirational for you as well:
(They referenced this site).
Forrester Rocks At Night - by brentbat
This is a fun technique to try out at night and is an ideal way of adding light to the scene to enhance a particular immobile object, such as a tree, rock face, bench etc. Position your camera on a tripod and ramp up the ISO to around 400. Dial in a shutter speed of 15-20 seconds and to avoid camera jog, use the self timer to activate the shutter. During the release, light your subject with a beam of light from a torch and ‘paint’ with the light to ensure the entire object has been covered.