My rear light bracket is made of 1/8" by 1 1/2" aluminum bar. Below is a pic. It is a bit crude because I made it in a hurry one day. I plan to refine it a bit, straight up crooked cuts, add reflective material to the mount itself, etc.. The pic illustrates the reflective lenses of the 8-LED marker lights from LED-R-US. These lights only draw 0.03 amps, practically nothing. They are probably fine for bicycle commuting, but I will be adding much brighter lights.

I couldn't resist including my helmet and some Glo Glov traffic gloves. The lower part of the helmet is blue. I cut blue 3M Scotchlite to fit the blue surfaces. Since it is almost exactly the same color blue as the helmet it is not noticable in daylite but adds a little more reflectivity in the dark. The Glo Glovs were designed for policemen directing traffic. The gloves are one size fits all lycra that easily fit over cycling gloves even on my largish hands. The back of each glove, left in the pic, has a reflective high visibility green triangle and finger patche while the palm, right in the pic, has a reflective red triangle. They seemed like a good idea for signalling and additional visibility. Since I have only had them a couple of days I'm still not sure they are worthwhile. I will try to remember to post a report in a few weeks.