Slain farmer Scott Guy drunkenly told his sister that Ewen Macdonald was the worst thing that had happened to their family.

Anonymous tipsters responding to an appeal for information on a vandalism attack have given police new leads on the murder of Feilding farmer Scott Guy and police have reiterated that information will be treated in confidence.

To some they're ugly scrawls that desecrate the urban landscape, to others they're street art. Paula Yeoman looks at the graffiti debate.