Just a breadboard, no button, and a slightly modified copy of the MaxMatrix demo, and I was up and running.

I have a ton of ATtiny85's so I always like to work them into projects. Behind the white breadboard you can see the smaller black one which is connected to an Uno (as ISP) for flashing. The extra step of having to move the chip for burning is a bit annoying but the tiny is just so compact and convenient.