Perhaps you could stencil a kind of Moroccan tile-effect pattern on them? Add an external paint as an undercoat and then stencil a variety of patterns. A few painted pallets as chairs/tables...could be sweet?!
Power wash to remove any debris or growth, perhaps use a concrete stain to colour them, use a separator, such as grass, treated wood or pebbles to create a pattern and re-lay the slabs. Use the edging to create a raised flower bed along the back or sides, and you might think about some adding a few sections of trellis to bring some vertical height to the walls and break-up the walls. An evergreen type of climber would provide colour and fullness both summer and winter. A few shaped pyramid junipers might do that as well, but they do attract mosquitos.
Are some coloured pink? If so I would be disinclined to power wash them unless you like that colour in patio slabs. I like slabs spaced out with either grass or concrete in a darker colour between them. It looks quite professional smart.
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