My own "Smarthome"-system based on a Raspberry Pi Model B. I am able to control the light, RGB-LED strip, Television and HiFi-system with it. And it can monitor the ambient temperature, CPU-temperature and the WiFi status.
A LED-Cube controlled by a cheap Arduino Mini Pro clone.
An LED strip which I can control with my "Smarthome"-system. An ATtiny45 decodes the data from an 433MHz receiver and changes the color or effect of the LED strip.
The blink1 is open source hardware and software. The first version of blink1 uses an ATtiny85, which I have already used in other projects. I built the circuit on a protoboard and use a diffuser from an defective LED-lamp, which works very well.