iGameboy - Springboard theme by Rob Sheridan.

For updates/info: http://macthemes2.net/forum/viewtopic.php?id=16790113

Instructions: This works best with 5 icon dock.  First, decide which five apps you're going to have on your dock.  Then rename the _buttonX.png icons in the "icons" folder to the apps you want to assign them to.  For example, if you want Mail to be the first app on the dock, rename _button1.png to Mail.png and so on.  If you don't want to use 5 icon dock, you can just omit one of the dock buttons - I suggest _button3.png.  This theme also requires leaving the bottom row of apps on the springboard blank.

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.