Since you have only 2 colors in the kitchen (yellow and purplish-gray), I would recommend you to add a new color to the scheme. The best-looking color schemes have 3 or 4 colors.
My suggestion is sagey-green - it will coordinate beautifully with both your cabinets and countertops/tile. Try Svelte Sage (Sherwin Williams) - it has enough gray in it to work with the countertops/tile, and enough green to complement the yellow of the cabinets.
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