Jeep Girl, you should also invest in the online Cake Central.com magazine for September 2010. I think it's about $6 to download the entire issue. I have that issue (online download), so this is the information:
On page 27 you see the 3 tier cake with a spray of GP succulents and a few flowers, then on pages 28 and 29 there are 32 separate pictorial, step-by-step instructions on how to make the succulents. Kaysie Lacky of The People's Cake, did the demonstrations and tutorial for the GP echeveria.
Another forum member in an earlier post you'd made about this cake had mentioned the September 2010 issue for the tutorial. That's why I bought it!
Ms. Lackey supplies a complete list of tools and materials needed, including colors and dust colors. She shows how and when to wrap each "petal", etc.