You might already know that I like the ESP8266. There is a cheap LED dimmer named H801 available on AliExpress and other Chinese web sites that uses the ESP8266 to control RGB LED strips. You find a bit technical information about in on this Dutch web site.
One issue is the simple protocol this device is using. While it has been reverse-engineered, the protocol is still proprietary and that makes it hard to integrate it into existing home automation solutions.
Note that the Chinese device shown above is not certified to be used within the US or EU!