At the moment I'm considering spraying a big picture of Joe Strummer's face on the back (probably a black, white and grey version of the cover of redemption song), The UK Subs Logo over the right breast pocket, the "keep out country clean" logo with "Keep our country clean" over it and "Bin the BNP" under it. The Napalm Death logo somewhere (probably on my right hip), along the left side, under my arm, I'll have "Very Metal" (as a tribute to the young Ones) and "fight war, not wars" along the bottom, at the back. What else do you think I could / should have on there?
I will add pictures to show you what I'm planning as soon as I can be bothered to photoshop them.
EDIT: Made a mock-up of the front. Please forgive the shittiness, I made it in GIMP and am pretty tired. I will now sleep before doing the back.
EDIT2: OK, done the back too. Again, sorry for the use of GIMP.