In every room except the half bath on the main floor, we painted all the walls, trim, doors, ceiling, etc., the same shade of white. Although the paint department was aggravated we didn't opt for at least a glossy trim (wanted it all the same) we did go with appropriate ceiling paint. The all white look, in addition to allowing artwork to pop, makes our small home look larger, helps it look brighter (townhouse = limited windows), really makes the uninspiring 70s trim blend in (the upstairs has new baseboard, so it's not 100% identical either), and also draws attention away from our popcorn ceilings.
Although I am actually painting the basement a colour in the new year (more info on our basement plans soon) I am very committed to white. To give everyone a little giggle here's a great video.
This is pretty much how we achieved the "gallery-white" look I was after (minus the teddy):
I needed this giggle too, because I am looking at a mountain of exams to mark. It's a good thing I buy red pens in bulk.