I've not done home christmas lights, but have done some DIY lighting and I really liked the DMXKing devices. They are full-on XLR DMX light controllers, but the

I've not done home christmas lights, but have done some DIY lighting and I really liked the DMXKing devices. They are full-on XLR DMX light controllers, but they are controlled by USB so it's possible to just code them using JavaScript or Python or whatever. Just write commands to USB and you can control 1 or 2 DMX universes per device.