The Instructables site have made a cushion using PicsToKnits of their Robot logo. They have done a great job of not only demonstrating how to use this site but also knitting an absolutely fabulous cushion. They went with the classic dimensions of 2×2 squares

completed knitted robot cushion
The Instructables user KiteWife has included photos of the process of putting together the squares

Left side of the robot cushion
This is the original image that she used to convert to a knitting pattern. It shows that often simple images work better than photographs as a starting point

Original Robot image
And here is the pattern from PicsToKnits that she worked from. Thanks for doing such a great job!