Which Flowers?

[kat-kin]

I've got a small wall 4ft high and roughly 6ftlong. My neighbours planted hydraengers on their side last year and they look nice but I was wondering what I can plant other than hydrangears. I like shades of violet,purples and pinks. Im no gardener as you can tell. tia.

[Buenchico]

This might help:
http://apps.rhs.org.uk/plantselector
(You don't have to fill in all the boxes; just use the ones which are important to you).

[hammerman]

We'll need...

Soil type (clay, chalk, dry, wet, stony etc)
Aspect (north, south facing etc)
what would you like (scent, foliage colour, evergreen, flowers)

[Chipchopper]

You could try try a ceanothus shrub, if the site is fairly sheltered, any well drained garden soil should do.
They are are very drought resistant and come in various shapes and sizes and a color range from white through to brilliant shades of blue.