Here are three experimental portraits.
The flash used is a Nissin DI466. A cheap deal. It works quite nice, but eats batteries. My dad bought one, and when I found out it syncs wirelessly to other DI466’s, I had to get one as well. The syncronization isn’t too stable, though.
The first and the last photos are done with long exposure and me running around with the flash. In the one with the two girls I even chose to show some of the blinks as an effect. The middle picture is the only one with two Nissin flashes used.
All three pictures are taken with my Canon EOS 400D and the 18-55 kit lens.