Here's a set of Girih tiles, as well as a box to hold them in. Based on these: Lasercut Girih tiles Which were popularly used in Islamic architecture. I find these more pleasant and fun to play with than Penrose tiles, as you're less constrained and don't have to worry about breaking edge conditions. They also look lovely when tiling a surface as the knotwork stands out while the joins are quite subtle. Choose a suitable wood or plastic for your box and tiles, and cut.I used the 3 line pattern to avoid having to paint segments directly, but you can delete the middle line and use a mask like sticky paper instead. Cut the file using high power low speed to get the edges free, and low power high speed for the lines. You can then peel back part of the mask and paint the area if you wish, removing the rest of the mask after paint is dry.On our 50W laser I used 10mm/sec & 45% power for the cut, and 50mm/sec & 15% power for the scoring. The concept of using the over/under design was inspired from here: http://itsacleanmachine.blogspot.com.au/2012/07/acrylic-girih-tiles.html