Bonjour Frenchy Pilou et PAQ,

Here are some links for tessellations :

http://forum.worldofescher.com/
http://www.cromp.com/tess/home.html
http://www.k4.dion.ne.jp/~mnaka/work.html and, some 3D, http://www.k4.dion.ne.jp/~mnaka/layerd.html
http://www.clarku.edu/~djoyce/wallpaper/seventeen.html

en français :
http://ens.math.univ-montp2.fr/SPIP/irem/archi/mathtxt/pavsom.php
http://pagesperso-orange.fr/therese.eveilleau/pages/jeux_mat/textes/chinoisF.htm