I would do one of two things:
Sash them with embroidered braid or my own cross stitched braid and have it framed with a glass front or put it under a glass topped table.
Embroidering on the block would detract from the delicacy of the painting and detract from the design.
P.S. I had not realised the size of the blocks when I first posted, as they looked like small blocks. Your idea of the quilt or something similar to the Magnolia quilt that was suggested.appears more appropriate now.