Wow, it sounds like you've got the perfect background for any color you'd like! The great thing about natural wood and white/gray colors is that they don't really clash with anything. I'd personally avoid adding brown to the mix, but any of the following colors would look great:
Dark purple
Teal
Green
Navy
Cherry red
Just remember, if you're using bold colors like the ones suggested above, keep them as accents - you don't want to go too heavy on the color or the room will start feeling really oppressive, especially if the window's small.
How To Use Accent Colors
Curtains
Bedding
Lamps
Rugs
Artwork
Decorations
The great thing about having such a blank canvas - which is what it sounds like you have - is that you can easily change the accent colors if you get bored with them. All the things listed above are easily replaced and don't cost much - you could try red accents for a few months, then maybe switch to purple if you're in the mood!
So far it sounds beautiful! What color is the woodwork, light, medium, dark? Maple, mahogony, pine, etc? Or did you mean the ceiling AND woodwork are white? Are you going for a soft look or would you like it to pop? Sounds like you've got the right background for almost anything you'd like.
How about a light antique gold for accent? Or perhaps teal? Navy would be striking and so would olive green. I don't think you want to go for a kelly or emerald, you could but it wouldn't be very effective. I don't think I'd go for chocolate browns because - to me, and it's very subjective - I'm not fond of brown and gray together.
If you want very soft, a pale aqua would probably be better than a truer blue, although baby blue would achieve a certain look. If it were me, I think I'd go for an ivory and pale lavender (with the french gray: Beautiful) but that may be too feminine for your taste.
You could use a variety of deep jewel tones too you know, maybe some maroons.
I LOVE the teal color combo with grey and some touches of light green! You can also paint the wood work (if it's the door or window trim) with a crisp white color! Will be gorgeous!
