Would this work for what you need? http://www.national.com/mpf/LM/LM3916.html#Overview
data sheet http://www.national.com/ds/LM/LM3916.pdf
You would pick the led colors to suit the voltages. The input voltage could also be scaled to suit your needs.
Or this circuit could be expanded to as many levels as you want; http://www.aldinc.com/pdf/cd_23001.0.pdf
Check out the link in post #4. That's what he has, except the LM3914 version.