We did a lot of work like this when I was at frog. Usually for large companies like Intel, Google, and what not. IDEO and Ziba do it as well. Usually these projects never see the light of day. Here is one that Intel actually showed at CES. 4 working prototypes were built using capacitive layers and projections onto holographically treated glass to simulate touch sensitive transparent LCD panels. The prototypes and programing were done at frog SF. A frog SF person (Katie Dill, now at Airbnb) actually presented it at a CES keynote, but dressed as an Intel employee.