Backgrounds add a new dimension.

I've added backgrounds to the game! Mostly some public domain and simple textures to hopefully encourage a Zen mindset. I also made a little "cup" type thing that holds the balls! These two tweaks really seem to go a long way to making it looks more like a game and not just a "project" anymore.  For now, there is a wide variety of backgrounds, some will work better with the game so over time I plan to tweak them based on which type of aesthetics end up feeling the best.

I didn't want to have the transparency of the container darken the playfield too much, so I cut out only the top part (but not the background, notice how the balls cover the back half of the "cup" but not the front? I thought that was a neat trick) and put a darker transparency there and then that transparency quickly fades away and you there is no effect on the majority of the board.