Just wanted to post a quick update to let anyone looking for a similar solution know that Karina's Batch Color Gadget works very well for the purpose I described above!

You just have to set up your materials so that the main color is driven by a Simple_Color node that's plugged into a black/0 Ambient channel. The Simple_Color node should also be plugged into whatever part of your shader tree makes the most sense. If I was still using the Blender method I started with, I would've plugged into the Blender inputs. But now I have it plugged into the inputs on a Clouds node that mixes two shades of the color. If I want to change the color on multiple props, I just invoke Karina's gadget, select a new color, and voila, everything has the new color! Very nifty. THANK YOU Karina!!

You can find the Batch Color Gadget on Karina's Sasha-16 forums in this post.

Here's a screenshot of one of my simpler materials to illustrate. (You'll note that I changed the name of the Simple_Color node, but the script still works!)

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TOOLS: MacBook Pro; Poser Pro 11; Cheetah3D; Photoshop CC

FIGURES: S-16 (improved V4 by Karina), M4, K4, Mavka, Toons, and Nursoda's people

GOALS: Stylized and non-photorealistic renders in various fantasy styles