What about a marble sink? If I had the budget, I would have done it! I love the examples I've found searching online, and it's amazing how this material can so easily covert to either an ultra-modern or uber-traditional look depending on the design. Whether a vessel, seemless sink, or farm-house apron sink, the look is timeless. And for me, I'm drawn to the heavily-veined varieties, I think I'd choose a Statuario or similar marble.
Love that seemless look integrated into the counters - clean up would be so easy!!
I'm really loving the black versions as well - so rich and sophisticated in it's simplicity:
via Vintage Mulberry
How about a combination effect enveloped in wood? It sure creates lovely tension between the two materials:
What do you think, if you had the chance would you use a marble sink?