Homebrew paint application adds Guitar Hero controller support
Artists can use the Grip's buttons as tool shortcuts in UAPaint - blue for the pen, yellow for the paint bucket, red for the color picker, and green for the line tool. Slick!
We saw the potential of homebrew slot-2 accessory tinkering with Mario Kart DS hacked to interface with Taito's paddle controller, but there hasn't been any advancements with that since, possibly due to the paddle's pricing and limited availability. With Guitar Hero's popularity and readily obtainable peripheral, hopefully we'll see more homebrew uses for the Guitar Grip!