A fantastic activity by Pam Burke! Students have to draw the graphs of functions on their TI-8x calculator (with an appropriate domain) to create a picture of their own choosing. You can download the worksheet and introductory Powerpoint presentation below.

http://www.geocities.com/pamburke74/PictureThis.pdf
http://www.geocities.com/pamburke74/PictureThis.ppt

Who is putting their hand up to transfer this activity to the TI-Nspire calculator? :-)