I usually like to have my orders with no joins in them. Recently I had a quilt almost finished when I realized that I did not have enough fabric to finish one border without a join. I tried carrying a block into the border and I didn't like it. I decided to join two pieces together with a diagonal seam and finish the quilt. The fabric was a fairly dark one and if you didn't know it was there, you would not notice it. Try it and see how you like it from a distance. You can always use a quilting pattern to go over the join to further disguise the seam line.