At this time of the year my berberis Darwinii is lovely. Orange flowers for several weeks on small evergreen foliage. Easy to control and prune. viburnum burkwoodii is another evergreen to consider as well as the varieties of mahonia.
I love my grasses....miscanthus variegatus makes an upright whitish impact grass ....I cut mine now and it will grow to 7 feet by autumn and keep,it's framework over winter. Calamagrostis brachytricha and Overdam flower late spring/early summer and throughout the summer and, again, with winter skeletons. ,all these grasses are well behaved, non invasive and stand up well against the wind.
Pampas grass? Yes it has it's place but it's a thug, difficult to cut back without cutting your hands and does not associate well with other plants.