I used this method for a pineapple table runner set on point. I had already quilted SID but chickened out on binding all those points and inside corners.
Then I saw Ricky Tims on Simply Quilts and used the method he demonstrated on an art quilt with an irregular outside edge.
1) I cut the backing in half and stitched it back together leaving an opening in the middle for turning.
2) I pressed the seam to one side and made sure to press the open part of the seam.
3) Then I sewed all around the quilt and turned through the opening in the back.
4) Finally I hand stitched stitched the backing closed.
Ta Da! I did not have to stitch a pesky seam on the outside edge of the quilt.
Hope this makes sense.
(edit)This is a variation of Evelyn's method for when there is not an outside boarder.