Use triangles from the left over fabric to fill in on the sides. You do not need another set of 6 identical - use what you have and try to match the colour shading of the hexagons they touch. You will find that the bits cut off from the ends of your strips might do well because you do not need a complete triangle to fill in these edges. Try fitting them in and see how this might workfor you. I have done many and this is what I have always used.