One plant which I love, and have threaded through my patch, is stipa tenuissima. It self seeds so its babies can easily be transplanted. Does well on the sunny side of my desert. Verbena bonariensis is another favourite, easy from seed and will set seed for next year if not arctic during the winter. Vb great either in clumps, or as a repeat. Along the same lines as Vb is thalictrum Hewitt's double, unfortunately sterile, but can be carefully divided in spring.