Originally Posted by PaperPrincess

...Another thing to think about. Too late for this quilt, however, is to oversize the triangles on the edges so that they extend half inch or so beyond the petals. then you could make some short vertical seams to join the edges of the triangles. This would give you a small border around the quilt and could attach the binding to that.

Originally Posted by Jennifer23

For the larger version, I would not cut the outer squares off to triangles. They could be trimmed to 1" beyond the edge of the quilt, the excess pressed in half, then folded to the back like a single-fold binding to finish the edge. If you cut them larger (sort of like oversizing a setting triangle), then the corners will overlap, and you can seam them together to get a continuous bias binding.