Great thread!
Here are a couple of my shots, hopefully they are ok for this thread.
Approx 5min exposure, car light painted with LED torch, interior green gelled wireless flash, trees red gelled hand triggered flash, front and rear or car hand triggered ungelled flash.
Approx 3min exposure, first painted engine with an LED torch closed the bonnet and painted the sides, roof and front of the car with LED torch. Fired wireless red gelled flash (behind car) and green gelled flash (on front seat) 3 or 4 times.
These shots were my first effort at this style of shot a bit of fine tuning to go yet, both shots pretty much straight from camera.
Cheers
Daniel