If you want larger pieces from some, then can you cut 8" squares? You can use the leftovers to make 8" comprised of smaller pieces like 4 patches or maybe pinwheels or some star blocks.
If you want to leave them as is, then improvise. Maybe put a border around the rectangles of landscapes and then fill in with different block of various sizes. You could even do a long rectangular wallhanging. I'm contemplating one like that to put over my china cabinet to fill in a bit of space between it's top and the ceiling.