I know this is an old thread but, I thought I'd chime in. I recently designed a board around the
Ws2822s model A pixel (RGB LED with the Ws2821 driver). They are wired in parallel and can be addressed with the standard DMX 512 protocol. BlinkinLabs paved the way here with their open source kickstarter project, the BlinkyTile (go Mat Mets and team!).
Because the pixels are essentially DMX devices, each one needs to be flashed with an address before it can be implemented in a DMX universe. WolrdSemi also makes a model B, which apparently has better heat management and the filaments are more uniformly centered on the LED.
The first couple boards came from OSH Park and were hand assembled. They're double sided boards with a pixel at center on either side so that they can be viewed from above and below. Here's a little pogo bed which flashes the addresses:
The run I'm doing of them is coming from PCB Cart, who are also doing the assembly. I just received this first sample and I have to say, PCB Cart did a great job. They have been super responsive and the price is really* competitive.
Top/Bottom: