A few wooden lines attached to a plant holder, in random fashion, is the easiest way to beautify the white walls of a small balcony. Again, different plants in pots of various shapes and sizes lends an effortless quirky twist.
I always like a wrought-iron bakers stand. I use this to house all my gardening bibs and bobs, little herb pots and my collection of grey tin pots, urns and birds. It makes a great display for the door out to the garden.