Ohhhh, we have a great article coming up during 'Sempervivum Week' that will answer some of those question.
Meanwhile, I like Bev's idea of buying some inexpensive pots of semps from your local big box stores.
Lithodora is a great plant to grow at the foot of your tall sedum, I love that picture in my head. Another great blue flowered plant is the ground cover type of veronica.
We will have a great discussion on this topic come Wed. next week. Get ready for some really great ideas.
Do you have your pad and pencil ready Jelinda?