Hi Brian,

Thank you for drawing my attention to Truchet tiling.
I had not been aware my earlier post was an example of them.
http://moi3d.com/forum/index.php?webtag=MOI&msg=7777.577

I followed your links, and after some further research
I have made another example:
http://moi3d.com/forum/index.php?webtag=MOI&msg=7777.731

Thank again for the inspiration
James