This is the basic "Perlin Rainbow" noise program for the ICSP-programmable Luminous Triad, and its variants. Schematics and PCBs are available here.
#Dependencies FastLED
David Mellis's Arduino ATTiny compatability configs
#Hardware Required For Programming A 6-pin pogo adapter, like this one.
A USBTiny ISP, like this one. (OPTIONAL: an Arduino Uno can also be used, but I prefer using a dedicated programmer.)