Orystachys iwarenge

Sometimes called 'Chinese Dunce Caps'

in the fall this succulent  starts  to put up it's flower stalks.

In the spring it puts out runners with little plantlets on the end and makes an interesting ground cover

It doesn't mind sharing a space , here with 

Hesperaloe parviflora grown from seed

that my son sent from the street plantings in Phoenix AZ

Here poking out amongst rain lilies

It is so happy in a  hypertufa container

Here is link to a Master Gardener website with instructions on how to make a hypertufa container
Do it with a group, we did at the Pitt County Arboretum
It's lots of fun
http://whatcom.wsu.edu/ag/homehort/hypertufa.htm