This pattern can be downloaded for free from my website because I am a strong believer in open source and free software. If you’d like, you are welcome to send me cash through my Paypal, or even better donate to the Electronic Frontier Foundation, the Free Software Foundation, or effective charities.

This pattern is for two different regular decagons (10-sided polygons). These can be used to make a nearly-round cushion cover, or potholders. The pattern works with provisional cast-on, no normal cast-on ever, and finishes with binding off at the edge. There is no sewing to make the decagons, but for the second decagon, it will be necessary to kitchener two tiles together. There are a lot of ends to darn in. And of course if you want to use these for cushion covers, then making the actual cushion cover will require some sewing.

This modular knitting system results in P3 Penrose tilings. It has a reasonably ok-looking wrong side. For more information on Penrose tilings and why they are interesting (at least for mathematicians), see the Wikipedia article on Penrose tilings. This pattern is handy to get started if you want to do a more complex tiling with this system, such as a scarf. I am planning to post a pattern for a scarf using this technique in the future. If you find any mistakes, or if you find something hard to understand, please let me know.

If you sell items based on this pattern, please include both the pattern and credit to me. If you create and distribute another pattern based on this, please also include a credit to me.