If you go with American Standard products for the tub and sink, you can almost certainly get linen or bone. AS has no shortage of undermount sinks, although I'm not sure I'd trust HD to get a custom cutout exactly right. (Maybe if your counter is not too enormous you could check local stoneyards to see if they have a remnant you like? With so many people abandoning plans for remodels due to lack of funds, many suppliers who are feeling the squeeze are more likely to bargain.) If they have a linen/bone/biscuit color in the standard sinks they sell with the countertops, it may be a lot easier and cheaper to use that. Do remember that unless the different fixtures are right on top of each other in a tiny bathroom, it's okay if they're not a 100% perfect match. Really. Especially in the case of that undermount sink, which not only will be separated from everything else by the countertop - which is what people will notice - but partially hidden by it at most viewing angles. In my last bathroom (which was 8.5x8.5) the tub, console sink, and toilet were all by different manufacturers who had different ideas of what "white" was, and I was the ONLY one who noticed. I asked several people and they looked at me like I had two heads. I forgot to notice eventually, and only thought about it when I was reminded by a thread like this one. (Man, I miss that bathroom. *sniffle*)

Other companies have colors they call linen or bone but it's not certain they'll match exactly - if you fall for a product from another company, call their customer service line and see if they have a color that comes close to AS' linen or bone. IIRC Kohler Biscuit is more or less equivalent to AS Linen. Get a color chip if possible so you can compare the two. (You can order Kohler color chips right from their website.)

As for the granite/tile color issue, you don't necessarily have to get "matchy-matchy" - if it's, say, a golden color speckled with brown, that's very neutral and you can put a lot of things with it without necessarily being restricted to shades of gold and brown. A mossy green, for instance, would be very pretty. Or one of those cool wood-look tiles, maybe laid in a herringbone (yes, I adore herringbones!) or basketweave pattern for added interest. For the wall tile around the tub you could also ignore the granite completely and work off the tub - perhaps match the tub color and use relief-patterned accent tiles (Daltile has scads of gorgeous ones) for a lovely monochromatic/textural effect, which is very elegant.

Thank you, Johnmari...lots to think about.