Watched a Fons and Porter show a week or so ago and the guest Designer using black white and grey tones had used a lot of the reverse side as well as the top sides to get the effect she wanted. Just looking at the quilt you could not tell it, they just looked like muted prints.
My DH also has several shirts where the back side of the fabric is the outer shirt and they look good...
So do what ever Floats Your Boat... your quilt, your fabric both sides... go for it... The quilt police can't arrest you for doing it... LOL