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
The Instructables user KiteWife has included photos of the process of putting together the squares
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
And here is the pattern from PicsToKnits that she worked from. Thanks for doing such a great job!