The Hexome is a monome built on a hexagonal layout. It has 61 keys illuminated by RGB LEDs, with proportional colour control. Examples are written in Processing of several types of sound sequencers, a natural harmonic keyboard and an electronic dice display. Driven by an Arduino or stand alone 168, and USB bus powered.
The Hexome was quite a hit at the NY Maker Faire in September, and a few other shows I attended over the course of this year so finally as promised I have the full construction details, software and CAD files.
Although I am not sure if anyone will ever make another I hope it will serve as inspiration and a source of circuity to incorporate into your projects. Enjoy:- http://www.thebox.myzen.co.uk/Hardware/Hexome.html