I got started on an idea on FM11 that put Terry Venables Crystal "Team of the 80's" Palace into the Premier League, simply to see how they'd get on.
I just couldn't bring myself to do all the attributes of the players. Fancy doing something like that?
What about a 'City' League? Manchester, Nottingham, Liverpool, Bristol, Sheffield, North London, West London, South London, East London, Glasgow etc. One team from two clubs.