Here's a thought...
This is such a great idea! I think you could go back through and build a rotation using all of Cathe's from when each series came out, I believe you could go back to Cross Train Express, at least, and use what she gave us. It would be like "a Year with Cathe" or something, but it sounds intriguing, especially if you mixed it up. Say an older series like CtX, right into a newer one, like Cross Fire, then back to, say, the Intensity Series. Something like that. I hope if someone takes the time to do it, they'll post it here so we can all jump on board!
What a fun idea for the new year!