Instructions for creating icons: Use the border layer as a starting point. The icons use four colors, including the background color. The background in the PSD is just for reference, you'll want the background color to be transparent when you save the PNG files. Use the pencil tool in Photoshop to draw nice clean pixel art with the four colors. When you're done with your icon, delete the background layer and resize the image to 60x60 (make sure you have interpolation set to "nearest neighbor" when you resize, to preserve the sharp pixel edges). Then drag the "pixel grid for icons.psd" layer on top of your icon, which will give it the wonderful dot matrix pixel separation of the Gameboy. That's all there is to it.