I love soapstone. I never have had it. Is this your kitchen or one you like? I think once you oil it, it does not look as green. You may be able ask for pieces that are not green. It may be hard to find a granite that does nicely with the soapstone. Maybe a lighter color with little grain. Or use all soapstone! I'd be careful what I mix with soapstone as it think it might make anything else look "cheap". What about a nice natural wood top for the island. It would bring in some warmth.

Some installers will recommend that a soapstone countertop be treated with mineral oil to help to maintain a consistent color tone. The treatment will change the color of the soapstone to a charcoal gray or black but is not permanent and will need to be reapplied monthly due to wear and evaporation.