No not back to back. I will try and explain it with words. I may do a picture tutorial if it works out. I am going to take a coordinating color of fabric (I have lots of black so that is likely going to be the color)
My crocheted blocks are 12 inch squares so I am going to cut the fabric in 16 inch squares (maybe a little smaller 14 inches haven't made up my mind yet).
I am going to get either felt or fleece (does not ravel) and cut silloettes or if fleece a specific pretty print (flower, butterfly, leaf, what ever strikes my fancy) and sew that to the one side of the fabric (outside),
then on the inside of the fabric I am going to center the crocheted block right side up, tack it in place, like w/ a yarn tie quilt,
then sew the individual squares together in rows, each square seam will be sewed in a fake french seam, there will be a few inches between crocheted blocks I will join them w/ a chain loop stitch.
When each row is finished I will join the rows in the same way w/ long seams.
Top side will be total crocheted blanket, back side will be squares w/ appliqued felt or fleece center and yarn ties. The fabric will add stabiltiy to the afghan so it won't pull out of shape as much.
That is the plan anyway, it will be more work then just whipp stitching it together into an afghan, but I'm hoping it will be more durable too. And a lot of the work can be done on the machine.