Karl is designing his own computer game. The latest version has a custom keyboard, and with the designer's permission, I am showing it to you here. If repeat patterns are your game, you will find a wealth of inspiration in this keyboard. I know I did!
Just for kicks, I selected one of the keys in Photoshop and defined it as a pattern, then filled a new page:
And now here's one of the keys, rotated four ways, then used it as a pattern fill:
Thank you, Karl.