You could use the small triangles you cut off & sew them together & make tiny squares, then put four of them together to make a small block & then put a sashing around them in maybe dark gray & use that for the border. If you don't have enough of the triangles to go all the way around it, you could add same size blocks of any left over fabric in the quilt & add sashing to two ends of them & alternate them around it. Hope you can understand or visualize what I am saying.