Not sure if it qualifies as a 'project', but I played around using my Netduino Plus 2 to turn on/off a lamp using an RF transmitter and a smart socket
I bought the following Kit: http://iprototype.be...first-rf434-kit, which consists of a 434Mhz RF transmitter and DIO smart sockets, and ported the arduino code for the protocol of DIO to netduino.
If I got it right this protocol should be similar or equal for multiple vendors including DIO, KAKU & Home-Easy as they all use the same hardware (signal length may vary though)
The source code for the protocol is available on github
Enjoy turning on/off your lamps or other stuff at home