Recently I had to use one of these digital controlled RGB LEDs in a project and was very impressed. I have used the WS2812B LED in 5×5 mm package and the APA102-2020 in a 2×2 mm package. The WS2812B needs only one serial data signal, while the APA102 needs additional a clock signal.
The WS2812B is a digital control able RGB LED. You control the color by using only one signal wire.
The APA102-2020 is the new model of the APA102 LED in a smaller footprint. They are very tiny, measure just 2 x 2 mmm.
They are controlled with two serial signals, data and clock.
Initially I managed to hand solder a LED, see pictures below.
Boards with LEDs
APA102-2020 single LED [coming soon]
A board with a single APA102-2020 LED
APA102-2020 8×8 Matrix LED [coming soon]
A board with 64 APA102-2020 LEDs.