Lavender and roses... glorious combination... :) The scents, combined--utterly enticing. I'm thinking, add jasmine! Lovely entry to the garden, and you don't need a brick wall to make this happen. Cue, for you, T.
Perennial growing height is important. Taller plants for the back of the border include Lillies, Acanthus, Delphiniums, Lavatera (Tree Mallow), Echinops (Globe Thistle) and Red Hot Pokers. Hollyhocks and Foxgloves give a real cottage garden look to your borders.