Guitar Tapping and Running

So in preparation for my first marathon in Edinburgh next May I'm scouting out some races before then to help get me fit and prepared. So far I'm thinking

Telford 10k - Dec 18th
Liverpool Half Marathon - March 18th
Loughborough Half Marathon - March 25th

Also interested of course in doing the Great North Run again next year, keeping up a 2 year tradition. Perhaps this time instead of trying to get a fast time (something thats hard because its so busy and quite a billy route) it might be more fun to do something ridiculous - costume or race stunt etc. How about playing the drums or guitar throughout the race? Maybe a group of us could form a mobile band. Or some stupid fancy dress - any ideas on something thats completely ridiculous and new? Idea's on a postcard