Eight SMD5050-packaged, bit-controlled, series-connected semi-intelligent RGB LEDs (WS2812). Placed approx. 7 mm apart.  Controlled as an NRZ bit stream, 24 bits per color. I.e., you can set each LED's color intensity value with 24-bit precision. Ready-made code and color maps are readily available, e.g., for Arduino.
Operating voltage 4...7VDC. Note! Current consumption max. 8 x 3 x 20mA = 0,5A. Solder pads below on a 100mils grid (e.g., for pin header).