I'm Addicted to Sempervivum
My favorite succulents are Semps - the hardy hens and chicks.
I am particularly partial to the blue ones. There are lots of different ones that show this shade, like Big Blue, Blue Boy and some others that are blue at times, then they change to other shades when the weather changes. The blue ones are best in the fall when the shade of blue intensifies.
Of course, there are lots of other blue plants, like some of the stonecrops, and tender succulents like Echeveria. But somehow, I keep coming back to these tough as nails hardy succulents.