Quantity   Component name
1 × ATTiny45 Smaller version of the popular ATMega AVR line used in the Arduino Uno.
3 × Large, diffused RGB LEDs Only two color channels used.
6 × Appropriate Resistors for LEDs One for each channel but you coulkd wire the resistors on the ground side in parallel.
1 × 5V Power Source for AVR Wall pack, 6V in AA batteries, voltage regulator circuit