White flower garden valley

Hi guys,
Some im looking at converting a section of my front garden into a white only themed area,its roughly 5 metres by 4 metres.at front of the house so is north and east facing.Some of it gets sun which comes over the top of the single story bungalow so its not exactly in deep shade but doesnt have full sun either.Im looking for suggestions to keep interest all year.Im going to start with a white annabell hydrangea right in the middle,have one or two white hellebours at the corners,was thinking a few white digitalis,lily of the valley and white echinacea.Any other suggestions and should i mix 50 50 shrubs and flowers,Also i find alot of the nice long flowering shrubs and flowers require prefer full sun so thats the challenge.


thanks