I was experimenting a few weeks ago and headed out one evening just as the sun was setting to do some long exposure shots. Both of the pictures below were shot at f/11 with the top one at about two minutes and the bottom one at roughly three minutes. I did it by using bulb mode in manual for the shutter speed and then timed it with my watch. For both photos I switched to tungsten for the white balance to get a very blue shift in color but the top photo was then also color shifted in Photoshop for a different effect. If you look closely in the bottom photo you see I might have captured a shooting star or at least that's what the light trail looks like to me. A happy accident.