I think the on point arrangement would show these beautiful blocks to best advantage. They could be complemented with color blocks and sashings. Actually, you could use more than one color if you wanted to. Be careful to use white batting if the fabric in the blocks is thinner than the fabric you use in alternate blocks and sashings. Please do not use an iron on interfacing on the back of the blocks. It will not lay flat because of the embroidery process. Another idea, if the embroidered blocks are 'thin' is to use a second layer of fabric behind them and treat the two layers as one in your construction. The quilting process will hold them together so it won't be obvious that there are two layers. Please show us your quilt in process or when finished. You are doing a great thing.