I started raising a Space Wolf army a couple months ago as a "lighter" alternative to my IG army (which is very tank-heavy).
Thematically, going for a mostly vehicleless army, so no Rhinos/Razorbacks. The only vehicles I'm considering are Dreadnoughts, bikes, and Drop Pods. Centerpiece will be my Thunderwolf Cavalry units... as I love me a good cav charge.
After getting bored with "normal" hair colors, I figured these guys would have no problems dying their hair all sorts of colors.