Basin Bowl
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 McCOY POTTERY USA 7528 SPECKLED BUTTER CREAM BEIGE WASH BASIN BOWL  US $19.95
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 PRE 1884 COXON CO IRONSTONE BASIN BOWL US $85.95
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 Large MO Porcelain Ceramic Bowl or Basin US $40.00
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Dark green tub black toilet what color should I tile tub surround and floor?
sink will be almost black with glass top and what color bowl (basin) modern look
what about a dark sand, and go "tropical" , or earthy themed in the coloring? As a bonus, it hides dirt well. 
Alternately, you could go with a crisp white, and use your towels/accessories for your additional coloring.
I think a lot of the other colors are going to be harshly contrasting against the fixtures. (I'd strongly stay away from yellows, reds/oranges.)
I think a rich sandy color (not too light- but nowhere near chocolate) would be great for the tilework though.