The American Mathematical Society's Mathematical Imagery includes albums of mathematically inspired works in a variety of media--computer-generated fractals, quilts, origami, sculpture, painting, and more. Each image is described and can be sent as an e-postcard. The 2009 Calendar of Mathematical Imagery features some of these beautiful works as seen on the thumbnail images below.
Download a pdf of the calendar (1.8 MB). To request a printed copy of the 2009 Calendar of Mathematical Imagery send email to paoffice at ams org and put "2009 imagery calendar request" in the subject line. The supply is limited so please limit your request to 3 copies so others may also have the opportunity to have a copy.