My idea would be to get an A3 sized piece of paper, and write confusing allegory in order to delude his flickr followers with such silly messages, rather than explicitly doing anything wrong. I'm far too passive, but I'd always choose the option to confuse, rather than to offend.
If you could manage to subtly advertise your own flickr links, too, that would be funny. He could edit them out (if noticed), but that's when large multi-coloured paper comes into use!
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Jamie M
Unregistered
RE: Stalking and Such V2