the only person i know of in the area that teaches a
PDC is Becky at blue planet earthscapes :
http://www.blueplanetearthscapes.com/
she is in manitou springs, but close
enough to COS to not make a huge difference.
There are others up and down the front range (Boulder, Ward, Trinidad) but i dont know of anyone closer to you.
Becky and gang are also involved in the transition town movement in manitou.
as for individuals practicing, i think there seems to be more and more every day.
you may look for a food coop or something similar in the springs, seems my coop was pretty receptive to
permie type stuff, and even had Becky down to give an overview talk.
hopefully you find something.