I wanted to incorporate some LED strips into my automation system and wanted to use an ESP8266 as the basis for it.
After I made it I saw on AliExpress they had something that turned out to do the exact same thing. Have a look here for a quick write-up about those.
Anyway heres the board I made that is able to do RGBW.
Etched, tinned and solder masked. This is a single sided (copper) board:
Bottom of board after components are soldered on:
Top of board after assembley: