Re: Crown Molding in Cape Cod upstairs bedroom
MLB's solution is the simplest, though instead of just leaving the one wall blank, you paint "trim" there, basically, just paint a stripe the same color as the trim to give the eye the impression of something being there.
Another method is to use corner blocks. These are 1" to 1-1/2" square blocks that are slightly longer than the trim is tall. Sometimes they have a decorative base, sometimes not. You install the blocks at each corner, which gives the trim something to but into other than itself. The longer angle cut on the trim is absorbed by the block.
Yet another method is to cut pieces to make the corner transition. Go to youtube and search "vaulted ceiling crown molding", there should be plenty of vids on the subject to show you how to cut your way around those corners.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!