This is a homemade patch that I have on my backpack:
The image is of goats with guns.
The text "Turn Illness Into A Weapon' was the motto of the Socialist Patients Collective, (SPK), a left-anarchist group of liberated mental patients who agitated in Berlin in the 1970s, and, after state persecution, their remnants merged into the Red Army Faction.
The goats are because they were the unofficial mascots of a Mad Pride community I was part of.
Also I want to buy one of these for my jacket, support a band with a lot of sentimental value:
http://panopticonmerch.bigcartel.com/product/new-logo-patch