About Rhythmic compositions using modular units

Thanks to my colleague Lucía Alvarez,you have a very interesting web application in order to create rhythmic compositions (In her blog "Las Tic en Plástica")
http://blog.educastur.es/luciaag/2007/12/04/crea-tus-propios-disenos-arts-and-crafts/

http://www.vam.ac.uk/vastatic/microsites/1312_artsandcrafts/design_a_tile/tool/loader.swf

More examples:
http://rodrigoruizdisenoi.blogspot.com.es/2009/07/subdivision-figuras-geometricas.html

http://www.flickr.com/photos/dietzsch/with/3094698516/

http://molylaxula.blogspot.com.es/2011/11/composicion-apartir-de-un-modulo.html