In order to setup your RaspberryPi for NeoPixels, follow the guide over at https://learn.adafruit.com/neopixels-on-raspberry-pi/ - they'll explain the wiring and installation of required libraries.
- Raspberry PI
- 18 NeoPixels (in strips of 6 pixels)
The softer parts of this project is written in Python (I'm definitely not a Pyton programmer so I'm sure there are improvments to be made in the src - feel free to submit a pull request).
If you are interested in the result or want to build your own clock - check out the video below.