In this planting bed photo showing foundation shrubs, note the use of both evergreen and flowering bushes (yews and azaleas, respectively)....
Photo showing foundation bed with mix of flowering and evergreen shrubs and a tree.
I snapped this photo in spring, when the azaleas were blooming. The foundation bed offers peak display at this time, as the red of the azalea blooms contrasts so well with the greenery of the yew foliage. Also note how the use of a small tree adds visual interest by injecting a vertical element into the mix of foundation shrubs.