A number of years ago (before I considered myself a quilter) I made duvet covers for my grandson's twin beds. I made 12" blocks with dinosurs appliqued on each. I added batting, then bleached muslin, stitched in the ditch between each square, serged around the edges and added backing to match the front. I made the opening up about 12" from the bottom with buttons to match the colors of the dinosaurs. Buttons at the bottom so as not to bother the sleeping boy's face. My daughter must have used these about 10 years, washing them often. The only thing that failed was some of my stitching around the dinosaurs. Oh, and I remember hand stitching around each applique to emphasize them a little more. (after the fact).