Sandy is here, but I don't have an answer for you either. I can tell you that you quilt very similar to the way I do. Here's what I'd do - I'd grab some fabric that went well with all three blocks and sash the smaller ones up so they were the same size as the larger one and just wing it. Unfortunately, that's not the best way to quilt and I should know because I have made way too many quilts that way.

Someone jump in here and save me . . . Karen!!!!!!!!