Let me clear things up:
Yes, there was once a time when you could change the textures of your bricks client-sided, I remember replacing the stud texture to a more conventional round stud.
Now it would appear that that is no longer the case; it is server-sided. Maybe you people didn't have Blockland before the textures were server sided, or maybe it was simply unknown to you at the time.
So yes, it used to be possible, but now it is not.
I hope I managed to stop all the butthurt and whatnot going on. But hey, who knows what you all will think.