I’ve just put up the beginnings of an article on the Colorado state arms on the society website at http://www.americanheraldry.org/pages/index.php?n=State.Colorado. Here’s my main illustration.

http://www.americanheraldry.org/pages/uploads/State/Colorado.png

In keeping with the other articles, I’ve stuck to the pattern used by the state for official purposes.

Very nicely rendered, Joe.  Any idea why they chose gules to be the color of the sky?  Is it supposed to symbolize a sunset or sunrise? Beautifully done.