barebone-attiny85-duino
I wanted to create my own little Arduino, so I build one that uses the attiny85.
I designed the PCBs in Eagle and ordered them from oshpark. My board only needs two passives: one .1 uF smoothing cap, a 10K reset resistor and a 4K7 resistor for the LED. The LED is attached to the pin 0 of the attiny, which is also the MOSI pin.
The arduino is programmed via ICSP. You can get a ICSP programmer for under 3 USD on aliexpress.
If you have questions, I`m @eliabieri on twitter.