I think these might work. They do well for me.
Delosperma cooperi - blooms from April to November for me or when the frosts hit. Cuttings of these root in a matter of days just by sticking pieces in the ground. It would be an excellent choice in my opinion.
The good thing about Sedum 'Angelina' is it doesn't have to bloom. The foliage is great all year round. You might try planting patches of it and other drought tolerant plants. Add some Sedum 'Blue Spruce' too.
It's not really a ground cover, but Yucca 'Color Guard' would make some great color in spots too. It looks good year-round and gets pink tints in winter. Maybe use it as focal points in certain areas. I think it may be my favorite plant of all plants for year-round interest. Also consider getting Hesperaloe 'Red' and 'Yellow.' There is a dwarf version called 'Brakelights' that is good. These multiply easily from divisions. I have rooted so many this past year. Nothing attracts humming birds like Hesperaloe.
I'm experimenting with Delosperma 'Wheels of Wonder.' The series is supposed to be very hardy and they seem to bloom a very long time. If the heat tolerance is good, it would be perfect. It's available in 6 colors.
Add in some Agastache too.
I would use some ground covers, but mix in larger plants in the background. You can't go wrong with that Yucca.
