Depending on vintage some Coleman Units have colored tubes. I painted some with a light coat of paint but now use a colred transparent plastic material I just get transparent color notebook indexes at te office supply store and cut it to roll isnide the tueb. I also make some small holes in it,
I see they are out of stick for the season.
http://www.noveltylights.com/Custom-Chasing-Rope-Lights-Kits/?altpath=N
I buy a e foot kit with chasing controller. Less than $20.00 each and last for years running 24/7/365. I just start with the cylindre on one end and run it down and up and into the next, and repeat. I put a female end of an extension cord whaer the old light was connected so I just plug it in. After a few years if the strin or controller fails I just unplug the old and plug in the new.