I made them a little generic, so you can use them for what you like. I made this while I was working on a tetris clone, so I figured I'd share. Note that the bit on the bottom right is for the borders. It's probably a bit confusing, but I'll provide a mockup once I make it that will give you a good idea of how everything is going to look. (If I don't get a mockup, I'll provide a screenshot of the finished game)