Heehee, I deserve my own post...
Often when I am faced with border issues I turn to partial or adapted blocks without any sort of separating strip next to what I call the bed of the quilt. In that case I work my border to fit my blocks which makes the math much easier -- and I piece the borders onto the blocks during construction, not as a long unwieldy length of fabric next to a solid lump of top. Of course, sometimes I want the look of that strip for quilting, but I can also get that by a plain strip on the outside of the pieced work.
Here's some pictures of partial block borders. First one is about 15-20 years old, it was hanging in the house I had given it to and I snapped a picture. Quilt is Storm at Sea, I call it Stars at Sea. Second is an all stash I'm calling "Not Quite Y2K". I stabilized the outer edge of the all those little seams with a line of stay stitching. Third is a houndstooth, half blocks and then plain fabric around the edge.