Instructions in the project. Draw CARFULLY and SLOWLY, especially you don't have a graphic tablet. At the end you can make a screenshot of your drawing. Here's a German version, which you can download as 1.4 project : http://scratch.mit.edu/projects/18128388/ In Scratch 1.4 you can easily make a "screenshot" of your drawing with the "scrap screen region" function.
The photographs from Wikimedia Commons are in public domain. Thanks to J0j2 whose project "cat tracer 1.0" inspired me to make this.