best bit of graffiti i saw was in childwall in the 80s.
massive painted white letters on a wall "FREE NELSON MANDELA"
underneath in red spray "with every packet of cornflakes"
I rather liked this subtle effort which was written above the men's urinal in the Turf Tavern in Nottingham c1979, the time Of Maggie Thatcher and The Falklands War.
"Keep The Malvinas British"