Decorating and Design - Tiny bathroom, trim paint color

Hello,
We have a tiny bathroom (40sq ft) which is in the eaves of our A-frame home so only half of that space is useable. The ceiling is natural oak tongue and groove planks, supported by white beams, all of which run from floor to ceiling at a sharp angle. The flooring is 6x6 rough tuscan tile, in a boneish-tan color, the toilet and pedestal sink are white and the fixtures and accesories are all brushed nickel. I think that I am going to put a sage color on the wall (TBD, pending your advice). The main question that I have is... the baseboard and trim, I know next to nothing about interior design, to make the space feel larger, should the trim and baseboards be the same color as the walls (sage), or should they be contrasting and match the white toilet and sink?
I am grateful for your advice-Vibeke

Painting the walls and trim the same color usually minimizes the effect of a small room. So does painting everything a light color. Dark colors and/or a lot of contrasting colors tend to make small rooms look smaller.

I am very tempted to paint (or rustic white wash) the tongue and groove planks. I know that is supposed to be a "no-no" but..... Please offer your opinions on this also.

Personally I hate to paint [or see painted] nice looking wood but lighter colors do make a room appear larger and will also make it a little brighter. It is your home so you'll need to make the decision as to paint the T&G or not.
Once wood is painted it is no simple matter to return it to stain or natural.

thank you Marksr,
I appreciate you volunteering your time and opinion.

What color is trim in the rest of the home? Most do all painted or all stained trim throughout the home for continuity.

Painting a small room all the same color and in a light color can help make it look larger but don't be afraid to use a different color on the trim. I have a very small bathroom and did something out of the ordinary. I painted it red and the ceiling and trim off white, with white fixtures and nickel accents. Looks really good and doesn't look any smaller than before.

my 2¢:

the trim in this room should be the same as the trim in all the other rooms, whatever that is.

as for paint color, do whatever enhances the room the most. do NOT worry about trying to make it look big. it's a small room. even if you painted every single surface white.......guess what? it's STILL a small room!!! but would you like it? probably not. it is what it is. make it as attractive & welcoming & quaint & charming as you can, & don't give "big" or "small" another thought. if you like the wood ceiling, leave it. it probably goes great with the floor tiles. i'll bet it's very warm & attractive. light sagey green walls would be great. and if the trimwork in the rest of the house is white, then go with white here, too. darker sage green towels would be a nice accent, but keep it calm & fairly monochromatic & simple & earthy.

that said, to answer your question, to make a room seem it's largest, remove anything that contrasts. therefore, you would want to paint your walls a color that is pretty close to the color of the wood on the ceiling, which should be similar to the color of your floor tiles. to keep such a room from being bland, use various shades of the same color and incorporate several different textures for interest.

but personally, i'd paint with the sage....

I've gone against the rule of trim consistancy when I did my kitchen and bath. My house is mainly dark trim, however, I changed my kitchen and bath trim to white (door trim and baseboard) - it turned out great and I don't see an issue with it not lining up with the rest of the house.
As for your bathroom, I would go with the white trim and don't worry about contrast. My upper level bath is about the same size as yours and I have huge contrast (tara cotta paint and white trim and fixtures - I for one like contrast - makes for a more interesting room.