If you have not yet, you owe it to yourself to check out UK artist Catherine Stones, particularly the work she does in creating interactive charts (http://www.catherinestones.net/1charts.cfm). There are few more exquisite examples of beauty meshed with functionality.
See below for an example, Catherine's "Lunch Hour Chart", which she describes here: "Mark the bricks with a black pen on the days you venture outside during your lunchhour. You never know...you could meet someone interesting or have an adventure."