Just move the sliders to the number of sides you want and the radius of the polygon and enjoy. This is just a component of another drawing: https://scratch.mit.edu/projects/85746396/
The drawing comes from the page "Fantastic Fractals" (fantastic-fractals.com). The author is Jason Padgett: http://fineartamerica.com/featured/octagon-limits-jason-padgett.html I reproduced it with Geogebra some time ago and use it as a pattern for my backgrounds everywhere. Now I'm happy to be able to reproduce it with Scratch as well :)
