Winter blooms add beauty to the landscape  in certain areas. Consider these ornamental shrubs:

Camellia – Hardy to zones 6 or 7.  large winter flowers

Senna (Cassia spp.) -  can be either evergreen or deciduous and most are tropicals and attract a large number of butterflies.

Flowering Quince (Chaenomeles speciosa) – Hardy to zone 5.  winter flowers are highly attractive to birds and produce fruits but are usually tinier and more bitter than edible quince varieties.

Wintersweet (Chimonanthus praecox) – Hardy to zero degrees. - late winter , the wintersweet blooms on bare branches with aromatic flowers.

Winterhazel (Corylopsis spicata) - sweet scented, bell shaped flowers that appear in dangling clusters

Primrose Jasmine (Jasminum mesnyi) – Zones 8-10. evergreen shrub with beautiful yellow flowers but not fragrant.

Winter Honeysuckle (Lonicera fragrantissima) – Zones 4-9. winter blooming shrub has highly fragrant flowers that appear as tiny white, or cream colored blooms in late winter.

For more information on these shrubs see http://shrubs.suite101.com/