I understand the OCD thing, I've got it as well. But, I would reconsider having everything match. Interiors are much more interesting if you have come contrast..in colors, textures and materials. Otherwise it looks like a polar bear in a snow storm and everything just mushes together. Your tastes and current bedding sound more traditional. I'd paint the walls/ceiling ivory to match the background in the bedding. Trim I'd paint a slightly darker taupe color (make sure it's not a pinky brown). Then I'd go to the home improvement store, buy some small trim and inset panels onto the walls, paint the trim taupe. Inside the panels I'd do the accent color, either the sage green or french blue in a shade or 2 darker than the bedding color. That way it will pop against the ivory wall. If you have a little texture on your walls, it's easy to get a faux look without buying any expensive Ralph Lauren stuff. Paint the background one color, let dry, then the 2nd coat paint a shade 1 to 2 shades darker, while wet, wipe off most of the paint. What's left will settle into the crevices and give a bit of a Venetian plaster look. You can add or take away as much of that 2nd coat as you like.