Sharon Craig did a lecture at our quilt guild and introduced me to coping strips. See if your library has a copy of her setting solutions book. Basically, when she is gifted a bunch of blocks made by various quilters and they are different sizes, she "floats" the blocks by adding coping strips to all the blocks. These coping strips then become part of her design and it is no longer noticeable that the blocks are slightly different sizes. I tried to post a pic of one I did this way but guess the file was too large. Guess I will have to figure out how to post pics.