http://www.princetonol.com/groups/iad/lessons/elem/patti-opart.htm
http://www.goodtricks.net/optical-illusions-optical-magic.html
http://www.ritsumei.ac.jp/~akitaoka/index-e.html
http://painting.about.com/library/projects/blpaintingproject11.htm
http://www.phillipmartin.info/webpage/student_art/text_art_studentpage.htm
http://artpad.art.com/artpad/painter/
http://ambientdesign.com/artragedown.html
http://www.mutapic.com/Index.html
http://www.mrpicassohead.com/create.html
http://www.onlinesketchpad.com/
http://www.knowitall.org/artopia/index.html
http://www.artisancam.org.uk/pages/activities/zone/
http://cp.c-ij.com/english/index.html
http://www.mypunchbowl.com/ecards
http://picturingamerica.neh.gov/about.php?subPage=about_ad_res