Instructables user jejl has created this lovely, chunky Back to the Future-inspired clock. Audio capabilities are provided via a Pimoroni pHAT DAC and controlling it all is a Raspberry Pi Zero W. As well as the time, which it can display in various formats, it can also show the weather forecast (courtesy of a feed from his Arduino-powered weather station). Read a complete bill-of-materials and a tutorial here. You can see it in action below: