Thanks for the input everyone, appreciate the fact that everyone is interested! The reason I wanted a fixed gear bike is because I currently have a specialized allez which I use for exercise at the weekends and getting to work on, and i wanted a normal push bike with no clips to get to town and shops etc, and for a bit of fun. Granted my bike is fun, but variety is nice. If anyone has any recommendations as to what you think I should do pleas let me know!
Sorry if I've repeated anything or talked crap I've just got back from the pub
Peace
Personally I'd look to restore rather than convert (there are far too many conversions of classic frames already), and I'd certainly want some sort of foot retention on a fixed wheel - it gives you so much more control. Whatever you do make sure you put drop bars on and don't get bar tape advice from SB! You'll also want enough brakes to make it road legal.
Unicycle.
YES!