You probably recognize boxwood as a favorite shrub that is often shaped into unique designs around garden areas.
The little rounded leaves and different laterals add a nice change of texture to your design.
You can also gain some height with the boxwood and make it a little taller.
I also added a snip of variegated leaves from a shrub in my yard. This shrub tends to turn bright yellow as the days get colder, but it was a nice green for this design. You can mimic the look with variegated pittosporum or variegated ruscus.