Kitchen cupboards for bathrooms?

I'm looking for a fairly standard furniture set-up for my bathroom.

120cm wide unit, half for toilet cistern, half for recessed sink with cupboard below.

I want dark wood, with a standard black worktop, but the "fashion police" have dictated that for the past few years everything must be white or grey...

Thinking about converting a couple of kitchen units to do the job instead.

Anyone done anything similar?