http://www.tessellations.org/
http://mathforum.org/sum95/suzanne/tess.intro.html
http://www.coolmath.com/tesspag1.htm
http://www.mathcats.com/explore/tessellationtown.html
http://library.thinkquest.org/16661/
http://members.cox.net/tessellations/index.html
http://en.wikipedia.org/wiki/tessellation
http://42explore.com/teslatn.htm
http://nlvm.usu.edu/en/nav/frames_asid_163_g_2_t_3.html?open=activities
http://www.mathcats.com/explore/tessellations/tesspeople.html
http://www.surfnetkids.com/tessellations.htm
http://gwydir.demon.co.uk/jo/tess/
http://tessellation.info/
http://mathworld.wolfram.com/Tessellation.html
http://www.pbs.org/parents/earlymath/grades_games_tess.html
http://www.mathpuzzle.com/Tessel.htm
http://home.comcast.net/~tessellations/tessellations.htm
http://arcytech.org/java/patterns/patterns_i.shtml
http://aleph0.clarku.edu/~djoyce/poincare/poincare.html
http://www.borderschess.org/KTtess.htm
http://www.tessellationsblog.com/
http://www.teachervision.fen.com/math/lesson-play/3522.html
http://www.taospaint.com/Tessellation.html