Our neighbours in Harrow painted their concrete terrace with pink and yellow squares to emulate paving slabs. It looked awful even when fresh and didn't stay fresh very long as the weather and passage of feet took their toll.
Use toning honey gravel with bits of grey in it to tone with your slabs. As suggested above, it will all tone down and age in time and the planting will soften it all anyway.
Grey may be fashionable but it can feel desperately dull for many months in a long grey winter. Honey is much warmer.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
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Use toning honey gravel with bits of grey in it to tone with your slabs. As suggested above, it will all tone down and age in time and the planting will soften it all anyway.
Grey may be fashionable but it can feel desperately dull for many months in a long grey winter. Honey is much warmer.