Originally Posted by Rebecca VLQ
I would say for each square, choose "at least" a light and a dark. Like, if you had a yellow and tan I wouldn't pair those together, but yellow with a medium blue and a tan with an orange would work....batiks are really mix-and-match, but you just don't want the (block) pattern to disappear.
I wouldn't consider this a hard and fast rule. Some of the most beautiful quilts I've seen have been low contrast.