I have a friend that did the same sort of thing. She was a new quilter then and it was only her second quilt. About 1/2 of her blocks were smaller than the others. We just added a little border of the same color background to the blocks that were to small. Then when we were laying out the quilt, we made sure to alternate the large and small blocks so it looked like she did it intentionally. I call little boo boo's like this a DESIGN OPTION.