Tesselating Escher lizards.
I've made plywood coasters from these, by sticking them onto a cork layer and varnishing.
There are several SVG files so you can customise them to your needs...
Two contain a single lizard each, one is plain (shape only) and one is decorated (including internal engraving details like eyes). These lizards are convenient for copy-and-pasting into your own design so you can make as many as you want - the overlapping segments can be easily deleted.
Two contain 3 lizards on a P1 sheeet, again one set is plain and one set is decorated.
The last contains 24 lizards on a P2 sheet, of which 12 are plain and 12 are decorated.
The tessellation means that the more lizards you put on a sheet, the more cutting lines are shared and the better the price-per-lizard.
The original SVG lizard was from http://www.seanmichaelragan.com/html/%5B2008-04-18%5D_MC_Escher_lizard_vector_art.shtml