Are these designs hand embroidered or are they printed? The way the "sashing" is, I'm thinking they might be printed.
I have yardage of redwork Sunbonnet Girls that are similar to this but they are printed. I'm tempted to embroider over them but lots of work doing that!
I agree to hand quilt around the designs and frame inside the "sashing". Depending on the size of each "block" you may not need to do anything extra within the block. But crosshatching or straight lines in a starburst would be very attractive.