Gimp create outline of image

Creating puzzle images with Gimp. Note: this article was written in 2003 or 2004. Gimp probably changed unrecognizeably since then, and none of this may be applicable anymore. I haven't used it since then. This article describes a procedure on how to create images that are shaped like puzzle pieces, like I did on some of my pages.

Flip a coin 1000 times java