Here's a list of some plants that will grow in Zone 8.

Sagebrush Mariposa Lily
Jerusalem Sage (Pulmonaria saccharata 'Sissinghurst White')
Freesia
Blanket Flower (Gaillardia grandiflora 'Baby Cole')
Gloxinia Penstemon (Penstemon x gloxinioides)
Strawberry tree (Arbutus unedo)