Following on from my screencast of how to do a fraktur "g" (see calligraphy), and inspired by a competition on TeX.SX, I've written a little article on calligraphy and chalk. It was initially intended as a submission for that competition, but in the end I think it breaks too many of the rules! You can:

• View the PDF
• Download the source

You'll need the calligraphy package (the files calligraphy.dtx and spath.dtx, run tex X.dtx to generate the .sty files).