I am not sure I like that idea, doesn't mean others don't but I played with that app Phone 8 that allows you to play with customizing the start screen including changing the size of the tiles and I decided it wasn't as cool as I thought it might be. But this is just my humble opinion. I wouldn't change the size myself but the colors and other things like that, yes. Plus I don't know if that would be possible with the way the live tiles are designed to work. I think it would be cool if the tiles themselves rotated as you went to the horizontal view, still scroll the same direction but at least I wouldn't have to look at them sideways anymore.