We're also thinking honed slate tile floors similar to these:
And I just had to blog about these countertops--they are exactly what we're lusting after. It's a little hard to see but there's delicate white veins and striations throughout the slab. Beautiful shade of what I'm probably (incorrectly) calling "light charcoal gray". I can't tell if it's granite, soapstone, limestone, or marble? From House Beautiful.