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I was in zone 7 for many years. I can tell you what I had success with. Some of these I have no experience with. We were at 4600 feet and had pretty cold winters.
I loved the hollies and ferns. Those did well. My mom has winterberry in her yard and they look great in the winter, not much else out there for color.
I had great luck with Oregon Grapes, Mahonia aquifolium. They thrived in acidic soils and were green all year long. Cedar trees did well. Red twigged dogwood looks great in the winter, especially in the snow.
We planted crocus, daffodils, iris, and day lillies in groups. It seems as one starts to die out, the other pops up and starts to bloom. When the Crocus would pop up, so would miners lettuce (dies out by early May).
I like hellebores for winter/early spring. Mine bloom in winter and early spring and are spreading. I had a winter daphne at one home but it was picky and not sure I could ever get another going! Down here, what we call tea olives give the most wonderful fragrances from small little flowers. It is all evergreen and makes a great specimen or hedge.