dynamic textiles
here's an example of data visualization using non-traditional methods of feedback, in this case textiles.
The REACH project demos a number of interesting concept prototypes that uses various materials to display information and augment existing communication techniques. These materials include 'cottons, woven linens, conductive materials, uv-sensitive textiles, thermo-chromic materials, & electro-luminescent wire'.
For more info, see the REACH page.