Thats not exactly what I meant, but it did give me an idea for something else :D
Anyways, what I meant was to actually CREATE the tiles in certain area all at once.
For instance I have a 2048x2048 layout and want to fill it automatically with 32x32 tiles (all the same or different, it doesn't matter), without resorting to going line by line (generating another tile 32 pixels ahead of the one before, then when reaching the end, go down 32 pixels on the Y axis and repeating).