There is globosa blue spruce--32 inches tall. I see you have a juniper, there are several more with silver blue foliage. If you want something different try Sawara False Cypress 60 inches tall with feather like foliage.

You do have a lot of evergreens Why don't you try mixing in a few flowering shrubs that would like the acidic soil that your evergreens need. A shrub like Hydrangea with it's large flower heads would look lovely and then front with a few flowers, either perennial or annual.