A while back I posted this picture showing my homemade handlebar risers/offsets I made. It worked out good but I really wanted it made out of corrosion resistant materials. A piece of aluminum and stainless became available at work, some left overs from an old project. Here is the revised version.
I have also seen posts of the infamous tool tubes but didn't really see a purpose for it for me, until I almost ran out of gas in the middle of nowhere and was totally lost. I now have one with an MSR fuel bottle for a little extra reserve.