When I helped out with Les Mis a couple years ago, we wove little red and blue lamps through the barricade to make it really pop. All the lamps and cords were hidden and the everything was on a
dimmer. If I had to do it again, I would do it with LEDs to make any color as well as the ability to mix and match areas or do one solid color. Looked really sharp with the way it was painted, little R57, and those lights made for a really cool look. Don't know if you can rent LEDs or can get some red and blue lamps like you find at Home Depot. Good luck and have fun, you can do a lot of interesting and cool effects with Les Mis.