That's a tall order! Most blooming bulbs flower for only several weeks. My suggestion would be to go the foliage route. Cannas are normally sun plants, but they will grow in shade too. Their foliage is spectacular, but they produce fewer blooms in shade. If you select one of the varieties with interesting foliage, you'll get the color you want all season. 'Striata', 'Phaison', and 'Cleopatra' have colorful variegated leaves. Cannas are hardy in Zones 7-11. In colder regions dig up the rhizomes and store them indoors over the winter. For more interesting foliage, try caladium (Caladium) and elephant?s ear (Alocasia). Both of these bulbs come in a variety of colors and leaf sizes. Caladium and elephant?s ear are tropical bulbs that will need to be lifted, stored, and replanted each year.