I'm not sure what seams you would have to grade. I have made Linus quilts with prequilted fabrics. I used a piece of prequilted fabric the size I wanted the finished quilt. I appliqued something or couched some kind of decorative yarn on them and bound them. I make a point to purchase fusable appliques at Joanns or where ever when they go on clearance. They make great decorations for prequilted simple quilts. The fabrics I used had finished backs.