Modifying 8.1 Start Screen Backgrounds?

I really don't like the new live backgrounds in 8.1 for the start screen. I've tried to get used to them, and a couple months later its still bothering me.

There was however a circles type one in 8.0 that was really good. Is there any way to get that back?

Also, it seems MS increased the spaces in between the tiles. Is there a hack of any sort to change that?