This script drives USB "webmail notifiers". These all seem to have a USB vendor id of 0x1294 and product id of 0x1320. There are many scripts like it but this one is mine.
pylight requires the docopt and pyusb modules, plus an appropriate USB backend on your system. On Windows I kind of just flailed around until the USB stuff worked. I think most of it came down to using inf-wizard from libusb-win32 to register libusb as the device driver for the notifer. I have also heard that Zadig might be better or easier? I dunno, I somehow got it working and I'm afraid it'll break if I touch it.
You can get usage by running ./pylight.py --help. By default all connected notifiers will change to the selected color, but you can also use command line options to select a specific notifer.
Feel free to open issues and pull requests with bugs / improvements.