Eight SMD5050 packages of bit-controlled series-connected semi-smart RGB LEDs (WS2812). Arranged approximately 7 mm apart. Controlled as NRZ bit string of 24 bits per colour. I.e. you can specify the luminance value of each LED colour with 24-bit precision. Ready-to-use code and colour maps are easily available for Arduino and other devices.
Operating voltage 4...7VDC. Note! Power consumption max. 8 x 3 x 20mA = 0,5A. Below solder pins with 100mils grid (e.g. for silicon glue).