How about a dwarf Alberta Spruce? Here is one I did on my porch last year. Because of the acidity of the pine you need to be sure you give the other plants enough soiland or nutrients. Ivy, lobelia, & bacopa all give a nice trailing look to the edges if you want something to trail down along with your flowers.
I also have some upright curly leaf ligustrum in pots flanking the stairs to our house. It is my understanding that if put in the ground ligustrum can become invasive. I've not seen it happen, but read that, so might be best to keep them in containers though many people use them readily in landscaping. I like their unique look and they are great in large pots as they can get pretty tall. You have to be sure ot get the upright type, not the ones that spread into wide shrubs. I got mine at Garden Supply on Old Apex in Cary.
You can get Alberta Spruce at almost any garden center. Both plants retain their leaves and color year round.
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