Woodstone-Visualization - The name and the story

Actually, it is very funny how I got the idea for this visualization. I was creating some image with GIMP and was looking for a texture looking like a grave stone or any rock. GIMP has a texture "Granit", but it is only 100px x 100px, so if you want to fill a huge plain with it, it doesn't look very good.
So I had the idea to create a rock texture for myself. It consists of grey scale colors and some "randomly" oriented lines. I tried to write a program which paints an image with grey scale colors, somehow randomly, but nevertheless somehow ordered. What would be better for this purpose than prime numbers? They seem to appear accidently on the number line, but although somehow ordered. I called the Java project "stone".
What came out, was far away from a stone texture, but what I saw, was much more interesting. Still my program code is in the project "Stone", although now I know that it is something else. But I did not change it, just for fun. So, one part of the name comes from my original aim.

But why wood?
At "Jugend forscht" (a science competicion for students up to 21 years) 2010 I showed these pictures to a friend and he said that it looks very like the patterns in planks of wood. Some of them really do. So I also spent some time trying to change my code to generate prime number images with the color of wood. This isn't that easy, but soon you will see some pictures here too. However, this is the reason why I also took the word "wood".
I combined them and it sounded good :)