Arduino library for controlling dual-wire-based LED chains such as here http://www.instructables.com/id/5x5-rgb-lpd6803-led-matrix-arduino-controlled/.
After downloading, rename folder to 'LPD6803-RGB-Pixels' and install in Arduino Libraries folder. Restart Arduino IDE, then open File->Sketchbook->Library->LPD6803-RGB-Pixels->strandtest sketch.