1) http://www.tonguemonster.com/images/animgifs/geometric/ringywhitesm.gif

2) http://www.keypress.com/sketchpad/

3) http://www.intent.com/tiling

background image used by permission of Elysian Publishing from Bruce Rawles' Geometric Tilings & Backgrounds "

4) http://members.aol.com/Cyrion7/celtic