7. Pay attention to your boundaries
In a small garden, boundary walls, fences or hedges may be the biggest element in view, so it's really important for them to look good. They don't have to all be the same but try to provide visual links between them. You could have the same type of fence, for instance, and grow climbers up them in in coordinating colours. If you aren't able to change the fences, whitewash them or clad them with battens or trellis. Check with your neighbours first to establish whose fence it is and ask permission before doing any work.
The materials you choose are key, too. For example, timber posts don't have to be confined to fencing a garden off from the neighbours. Carefully positioned within a garden, they can be used to frame plants or seating areas and add extra interest to borders or paths.
A really inventive use can be seen in the NHS 70 Garden for Addenbrooke's Hospital by garden landscape company Bowles & Wyer. They used reclaimed oak posts to frame the view along a meandering path at its centre, positioning them at different heights and angles so that new aspects of the space open up to visitors as they make their way through.