Try this pattern. Use it like graph paper and color it different ways till you find something you like.
http://gwydir.demon.co.uk/jo/tess/hexsqtri.htm Think gemstones!
There are also hexs and triangles as mentioned
http://gwydir.demon.co.uk/jo/tess/hextri.htm
And colored examples of all shapes that tessellate
http://gwydir.demon.co.uk/jo/tess/grids.htm#hexagon
Have fun. I use this site often for my quilt designs.
(thanks for the bump, sandpat! :wink: )