Well while I was working on my sampler I found out something interesting that I had not realized for those who like to do stuffed applique or trapunto.
I had a poppy motif done with a small blue monochromatic print. The trapunto has just about disappear. It is totally overridden by the print on the fabric.
So I would suggest that for this type of quilting technique you might want to stick with a solid tinted fabric. Those are the light pastels. Since the trapunto will create the greatest shade/contrast.
The other option with the stuffed applique is to use the lighter/dominate color for the stuffed portion and then a darker color or pattern for the background. An example of that is the lady that makes the great quilted bowl. I can't remember her screen name at the moment.