We are in Newcastle for a Workshop working on a new idea for tangible UIs that can be easily customized. The basic idea is to senparate functional parts of the system (electronics etc.) from the shell/tangible components of a devices. By this we hope to support innovation in a sustainable way. The skin of the appliance is printed (in 3D).
Nic Villar came up from Cambridge and he showed us some interesting materials… and obviously there is a shop (materials.
http://www.mutr.co.uk/) to get those… Look in the section for smart materials – there are probably many ideas hidden for now interface technologies – not only for tangible UIs.