Here are pics from my house of before, middle, and after. The angle of the after pic doesn't really show you the height of the bed, but you can see that for things to look good for many years down the line, you need to be abundant with the space you give things. The tree on the left is a Tamukeyama japenese maple (very hardy) and the smaller plants are some variegated thing I can't remember. I used blood grass behind the large stone in the middle to eventually cover the gas meter (which it now does). The middle tree is a dwarf burning bush -- I'm not crazy about this tree to be honest and would like to replace it next year. The right is the weeping blue atlas cedar with red flower columbine in the front. Then some ornamental blue grass on the edge of the bed, which goes down around the side of the house.
By no means an amazing bed, but I was pretty happy with it. Planting in threes is also a good suggestion. The maple + two variegated plants in a triangle. Triangle for the two feature trees and the middle feature-ish tree. Three columbine in a triangle around the weeper, etc.
The day that we put an offer in on the house
Yews gone a few weeks after we moved in
The day after we finished the bed (and powerwashed the stone)
I don't have a picture handy from this summer, but things have filled in nicely.