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For some wall hangings I sew triangles in the corners before I sew the binding on. Just cut squares to what ever size you think are right for the project and press them on the diagonal. Place them in each corner and machine baste them about 1/8" in from the edge and then sew your binding on in whatever fashion you use. Just cut a dowel to the width you need and slip under the corners to hang.
Hope this gives inspiration.
peace