RTF is a global modification that replaces all towns in the game.

Why are you all so fixated on the same colors? :D Is it really that important?

Added 2 minutes later
Forgot to mention, I also want to replace all the elementals with the ones from Heroes 6 and 7.

Well, it looks nice, don't you agree? ... Although, of course, it's unlikely that anyone would choose units from the same column just because they want everything to be the same. :)
I'm not against using models from Heroes 6/7. It would be nice to add a new castle to the merge, for example, the Academy from Heroes 7... ;)