Hi, I’ve had some LED rings made (160mm, 100mm, 95mm and 80mm) and have some spares, so I’ve put them on ebay… (I hope it’s okay to post this, thanks)
http://www.ebay.co.uk/itm/271993475262
These are actually SK6812 LEDs, which are very similar to the WS2812B, they appear to be fully compatible with FastLED 
They can accept data at up to 800 Kbps. There is a random data sheet on them here https://drive.google.com/file/d/0B97rs4obIwdZUm8tUkQza1VTcXM/view
That’s Mike, I’m not actually expecting to sell any on their own. I’ll be fitting them in cars headlights and supplying controllers, power supplies etc. These are the bigger than those sold by other vendors (apart from the 160mm four quarter ring by adafruit).
I thought as I had them, if post them on eBay as people might want bigger rings for projects.
My controller is coming together nicely, thanks to FastLED