When I made mine, I cut out a solid color the same size as you quilt block, and then cut them in half from the right bottom corner to the top left corner. Then I sewed them together to make the quilt square all the way around, then add your borders the sizes and colors you like. I would take the three fabrics and fold them the size you want to make the border, and then you can see the way it looks before you cut the fabric. Good luck with it, I hope I explained it so you can understand what I mean.