I've looked into this issue for Missouri since I'd really like to light up my bike like the 4th of July. First off, I am not a lawyer, and this is not legal advice, of course. In my understanding, there is no law against having accessory lights, but there are regulations on the color, direction and distance visible.
RSMo 307.175 and 304.022 address these. The use of blue lighting is prohibited except for emergency vehicles. Red lighting can only be visible from the rear of the vehicle. Per 307.085 you can have up to 2 side fender/cowl lights, either white or yellow and 1 running board light on each side, white or yellow. Per 307.100 no kind of flashing light is allowed (including TireFlys). And Front aimed lights are limited to 4 above 300candlepower. Read more here:
http://www.moga.mo.gov/statutes/chapters/chap307.htm