k3n, here's a site where you can design yout own tessellations.
http://gwydir.demon.co.uk/jo/tess/tess.htm There are many fascinating things, not to mention great design possibilities, there, so have fun exploring the entire site. Here's the site index
http://gwydir.demon.co.uk/jo/tess/index.htm
And here's another to explore
http://www.tessellations.org/tess-site-map.htm
and another
http://library.thinkquest.org/16661/index2.html
and one more
http://www.zianet.com/breynold/tessel/tessel.html
Needless to say, I use tessellations often in my quilts and love to play with them. :oops: Have fun!!