Looking for a suggestion on a flowering plant...?

I have a lot of green shrubs and plants in the front yard. Aside from a hanging basket with some petunias in it, there is very little color up front. I would like to plant flowers or a flowering bush to liven up the front of the house. Pink, white, or blue would be great. Had considered peonies but I'm looking for something that is continously flowering all summer rather than just a spring bloom. The front of the house faces north. I'm in Minnesota. The new plants would be located directly in front of the house. The eaves extend about 3 feet. So the area is shaded most of the day. In the peak of summer it will get about 3 hours of direct sun. Otherwise it's just getting ambient light.