Sashapowell82, all my recommendations you only need one. Jasminum is a climber and gets woody at the base as it matures. Can be semi-evergreen in mild or less windy areas. Will cover nearly half of your back wall if you let it, but easily controlled by cutting back and training how you want it to grow.
Tropaeolum Speciosum acts like a perennial and can easily be pulled out or cut. But wait for the autumn fruit that looks amazing when you will get a two-toned effect of blue and purple. A really special plant if you have the right conditions.
The Ornamental Quince is a woody shrub that loses its leaves in winter, but always looks stunning as the blossoms appear when nothing else grows in the garden. The leaves makes a good backdrop in the summer months. Your borders look quite narrow and shrubs not only grow upwards, but also fills out, so always avoid planting too close to the fence/boundary. Think about long-term and the roots.
Cambridgerose12's extensive list consists mainly of climbers, shrubs and very choice plants that I feel you would only need one. All perennials can easily be divided up or in some cases, if you buy in 1-2 litre pots can be split up or sliced in to halves or pieces. They fill out quite quickly if planted in spring. If splitting, it's classically odd numbers like 3s and 7s. But doesn't always apply in small borders.
Work in stages. Shrubs and climbers first and then look at your spaces left and then deal with the perennials and bulbs.