How do you decorate a concrete retaining wall?
How to Beautify a Concrete Wall | Home Guides | SF Gate
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You can hang garden art on it, or archectural salvage. Paint a mural , whatever your style is.
I planted fig ivy on ours
You could stain the concrete wall a color of your choice and plant some flowers or shrubs in front of it: https://www.doityourself.com/stry/how-to-stain-a-concrete-retaining-wall