It's been a while since I sat down and played around with the pen blocks. I have to say, I quite enjoyed it! :)
I had to make some compromises in line quality to increase performance. Not great, but it's the best I could do.
Just noticed something fun: If you cross your eyes a bit, you can view this like it's a Magic Eye picture (more formally known as a stereogram). It doesn't really have a strong 3D effect, because the squiggles are all equally spaced, but it's kind of fun anyway. :P