A bit of something different, but I had a trip to London over the bank holiday and when in Trafalgar square there was people 'Being Art' on the fourth plinth, anyone can get an hour up there although it's limited to 2400 places. A great publicity stunt and an opportunity to show of painting skills would be to get up there and paint a shell or something else for that matter... Here's a link,
www.oneandother.co.uk
Some people did nothing, or just read a book - boring, but to see an expert at work would be impressive..