Cuttings of flowers and shrubs (Lion Gate TW9)

I moved into My new place about 8 months ago, I need to add some colour and height to the garden.
  I am looking for cuttings of flowering plants and shrubs with different shades of leaf colour.
  I don't own a car, so, Richmond upon thames, would be better, but I can also travel by bus to places not too far away from me.