I just bought manga volume 38, and one of the articles in between the chapters showed this picture which I found interesting. People who buy the official manga will know that Kishimoto includes short stories usually on his past experiences, how he came to love DBZ, etc. Among those stories are also fan art, and introduction to his staff members or his assistant artists. This picture is drawn by one of them. There are other pictures, but not as creative nor interesting.

Sorry for the low quality. I don't have my scanner with me and took this with a camera.