larkspur- they last well in water and can even be dried. Canterbury bells, wallflowers, loads of bulbs, gaillardias, cosmos, delphiniums, perennial sunflowers, rudbeckias, echinacea, heleniums, crocosmia, redhot pokers, grasses, especially stipas and miscanthus, pinks, sweet williams, scabious, salvias, calendulas, anenomes,...... flowers have been taking over my vegetable beds but i am just going to sow around them and call them potagers.
have fun
oh, yeah, thunbergias and morning glories are good too.