I don't think you need to have the trim match from room to room. It's okay if the dining room's trim is white and one thing, while the living room has stained trim in a different pattern/style/wood/flavor. You could, even, play up the differences, as a way of demarcating rooms.

Bear in mind, I'm a chromaphile and would have colorcolorcolor everywhere, so I might not be the best adviser for this.

And yes, fiberboard suxxorz.

Stasia