Echinops, Sea Holly, springs to mind take a look at http://www.google.co.uk/images?client=safari&rls=en&q=echinops&oe=UTF-8&redir_esc=&um=1&ie=UTF-8&source=univ&ei=XkLyS_nJFoGI0wSLk7SeDQ&sa=X&oi=image_result_group&ct=title&resnum=1&ved=0CCwQsAQwAA

Pittosporum tenuifolium "Silver Queen". Gets large eventually, though.

Smaller shrub - Convolvulus cneorum - very pretty, though a bit short-lived and rabbits ADORE it.

senacio greii Sunshine bush has yellow daisy-like flowers June-July. Very suitable for sea-side. grows about 4ft (evergreen)