Erm. The colour coded system of years gone was only applicable to away games.
It was blue for home and away (1 season) and white for away indefinitely. Now all non-STH are just lumped in the 'general sale' with no additional memberships, which is fine for me but this has inevitably led to some confusion over whether people are eligable.
It's the start of a new system though and I'm sure the loyalty scheme will be a success... as I said, it seems a fairer way of dealing with both home and away tickets.