The web is awash with tessellation pages, and any search engine will get you started.

I'm only listing a few select resources here:

Science U's Introduction to tilings

Jill Britton's Symmetry and tessellations links Jill works hard to keep this list of school resources up to date

Marjorie Rice's Intriguing Tessellations are a delight. Features pentagon tilings she discovered.

There are only 17 Wallpaper patterns - no more, no less.

Totally Tessellated is a prize winning resource with many pages

page date: 23Oct05.      I enjoy correspondence stimulated by this site. You can contact me here.