SheGlowsPale ...
http://www.flexbandonline.com/jumpstretch.htm
If you spend some time on the Crossfit Journal you should be able to find some archived articles specifically on the topic. I think I have one on my computer at work so I will check tomorrow and get back to you. Basically, I use the green band for beginners, and when the band becomes too easy, I move them to the purple band, then eventually to body weight. Some times people may even require a combination of the green and purple, then to the green, then to the purple, then body weight.