This year, we used Adafruit APA102 DotStar LED strips controlled off the SPI on the RIO. Incidentally, I'd prefer to use an external device (probably arduino) to not soak up processor time on something which
probably isn't as important as actually controlling the robot. However, if you're interested, here's our driver for those from 2016:
https://github.com/RobotCasserole173...sLEDStrip.java