Almonds and walnuts. They have beautiful flowers - pink and white - and are native here.
Of course, Eureka lemons are wonderful and native as well. Do not, however, try to plant different citrus plants next to each other, like lemons and limes. You will wind up with really sour lemons because citrus trees cross pollinate.
Crepe Myrtle is a very pretty tree that does well here, too, but I think it might like shade a bit more (not sure about that).