So I have a brand new very long raised border (10 metres) edged by sleepers. If faces west and the soil is quite heavy. I'd like to get a lovely cottage garden look which is full of flowers and colour in spring and summer but I don't want it to look dead and sad in autumn and winter so there needs to be plants not just bulbs. PS I don't like yellow 
I would so appreciate your thoughts as I am hopeless with plants.