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What about a winter flowering clematis? It could be in a large tub by the wheel and twine it's way through it - some need sunny spots but there are a couple that I think could cope with the shade http://www.taylorsclematis.co.uk/clematis-winter-clematis/
and then you could have some others that flower in the spring and summer as well.
And you could have some tubs on the ledge on the left, and then have some of the herbaceous clematis trailing down - Edward Pritchard http://www.taylorsclematis.co.uk/clematis-edward_pritchard.html would look lovely tumbling over the edge.