ShiftBrite + 2 6pin header -

ShiftBrite is a high-brightness LED module containing red, green, and blue elements. It uses a simple clocked serial interface to receive a 10-bit brightness value for each color, resulting in over a billion possible colors. Each input is buffered and output on the other side of the module. This allows each ShiftBrite to repeat the signal to the next, allowing longer cable runs between elements without excessive loading of microcontroller I/O pins. ShiftBrite elements feature current control and automatic overtemperature control (an overheating channel driver will shut off until it has cooled). Each channel can also be adjusted with a separate current control register, for fine tuning of each LED if close brightness matching is necessary. The integrated voltage regulator powers the internal logic, allowing a single 5 to 9 volt supply rail to power the ShiftBrite chain.

ShiftBrites dont have 'memory' like BlinkM's do, instead they need a controller. Luckily, any microcontroller with 4 pins can do it. These modules save you the effort of wiring up tons of '595 or other shift registers. Every time you want to add another 'pixel' you can plug another ShiftBrite onto the end

MaceTech has example code and documentation on their site

Metalab Blinkenwall Alpha 0.1 from Overflo from Metalab.at on Vimeo.