Go around with the darker stain but use a lighter hand so the light and the dark both show, but because I want this part dark I made certain the darker stain was more prominent.
The central tiles, here I mixed brown stain with a fawn colored opaque acrylic and my yellow and sienna tints, dab and blot it here and there until the surface is covered. Layer two for the center tiles was a white mix similar to the boarder but a bit more translucent. I just slothed it randomly and thickly here and there leaving some grey concrete exposed covering parts of the fawn stain, a very random and not planned pattern. Let it dry.