I get the idea, but what i'm looking for is more of a patchwork quilt than just one textyre on top of another.

If you've played Starcraft, C&C or even Transport Tycoon you know what I man.

Transport Tycoon is in fact the best way to see what I mean.
If you blast/clear a already cleared square, you see it gets a new texture each time. (I think there are about 4-6 different grass textures in the game)