Peter writes-

Bob Collier has been reimagining thumb pianos, making his own instruments into unusual cases (camera and jewelry cases), adding fake fur, and integrating features like “self-sampling” voice recorders, amps, and speakers. With some light effects, the instruments take on entirely new characters, and he’s worked up a mind-boggling number of variations on the theme.

He explains a bit about what when into the design, including some inspiration from people using their thumbs on Blackberries and cell
phones…

Reimagined DIY thumb pianos, amplified, electrified, and with faux fur – Link.