Suggestions for box plants please.

in Plants
As it is a dull and rainy day here I was looking out the window and noticed that the flower boxes around the banya are not really giving the effect we were expecting , almost all marigolds , very boring I thought , any suggestions for a more exciting effect for next year please?
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Hope I did not offend marigold lovers but would really like to hear from you experts if you have any suggestions for a better plant for the boxes, please!
I think that a different colour would have more impact - the orange of the marigolds is too similar to the red/orange of the brickwork.
What about something blue - one of the little trailing campanulas perhaps - they'd contrast nicely with the brickwork and also pick up the blue tones in the roof.
Campanula poscharskyana
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Dovefromabove , love the name, and thanks for responding , they look beautiful , a toast to you this evening...and that is a vodka toast with the mother in law at the dacha this evening , really