Posted: 15/03/2014 at 13:43
You asked for evergreen shrubs but acers are not evergreen of course.
Evergreen shrubs like hebes amd escallonias provide flower too. Eleagnus provide variegated evergreens with scented flowers. Lonicera Baggesons gold is fairly quick, evergreen and colour from olive to bright yellow in summer. Pittosporum, like Garnetti, grow quickly with lovely foliage. Berberis Darwinii is evergreen...I find it quick growimg.....and currently producing beautiful orange flowers. Olearias, hollies (not as slow as rumoured) and mahonias.
Not evergreen but buddleias are very fast growing and provide a framework to hide behind too, depending on how hard ??ou cut it back.
Why not add tall grasses? Ok, not much now but varieties like Calamagrostis make 6' folkage by late spring until winter. Miscanthus will make 6' by mid summer and throughout winter.