schizostylis springs to mind. Will flower right through if winter mild enough. Available in pink and white. Tend to find it with marginal water plants although it will grow in any moist soil.
Good old daffodils. Should flower in late winter unless we have another year like this one!
Ornamental cabbages. Come in an array of different colours and forms.
leucojum vernum. Spring snowflake. Very tall good for cutting but usually flower around March so not sure if too late for what you want.
Some grasses have lovely heads that can be used.