There's some great ideas here and a few that I would steer clear from.
I made a little pouch to carry a pair of MSR bottles; mounted to the rear fender. Keeps everything "Streamlined" clean and simple. Looks similar to this.... http://www.motorcycle-superstore.com...Tool-Pack.aspx
BMW 1200GS ADV, KTM 625SXC, KTM 950SE
Yamaha R1, Kawasaki BF V750