I am assuming then, that it gets at least a half day's sun.

Of course any sedum, sempervivum or jovibarba should do well. Surprisingly many penstemons do well in dry also, although the motif will take a turn for the different. Also prairie plants in general from short or mid grass ecosystems too. They are the drier prairies, and naturally have roots that grow way, way, way down. Some of the grasses, like blue grama (Bouteloua gracilis) or little bluestem (Schizachyrium scoparium) might look good. Of the prairie flowers, Silky aster (Aster sericeus)would look cool. Wiry stems on a short 2ft or less plant with sparsely set silvery leaves. It does not spread underground.

Rick