When I first hacked my 2DS, the first thing I did was look for custom Puyo Puyo themes, but there aren't a lot out there unfortunately since Puyo Puyo is so niche in the west. So when I had some free time, I decided to make my own themes and splashes. I was worried that it would be an involved process, but I decided to give it a try anyway, and it turns out it's pretty easy! You can find them all on my profile here!