While doing a work assignment, I downloaded Rui Teixeira's (SlykDrako) "Ciclos Town - 10 Male Characters (C.C. Zero)" and used it as a base. I liked the models that he did ok. But I was not happy that There was little in terms of creating simple facial expressions. So I used the original base model (included in the blend file) and "went to town" so to speak, and made several upgrades.
1.) The most noticeable change, is that I made 5 female character designs, since the original had none. 2.) added mouths and eyebrows which can be controlled with shape keys that I've already added. 3.) not a big fan of using UV Maps to dress characters, I simply created the clothing with simple mesh duplication, in order to give more volume 4.) Along with point #3, I added hair styles not found in the original file, some of which (in the female hair styles) that can be controlled with simple bones that were added to the rig.
I'm keeping the file as CC Zero, since that is the license of the original creator. But by all means, if you like the changes I made and plan to use it, let me know, I'd love to see what the rest of you blender heads to with these.