The book that Lorchan is refering to could be 'The Essential Quilter, Tradition, Techniques, Design, Patterns and Projects' by Barbara Chainey, pub by David & Charles. She also brought out a book which I think is called 'Quilt It'
You could try googling 'Wholecloth quilting'
Sorry it is so pale, in a bit of a hurry. But this shows what you could do with just using a quarter circle template with the radius taken from the length of the basic rectangle size of the block ( the rectangles are 19.5" x 18" because I wanted a 6' x 6'6" top and I just divided it in fours). But once you have 1 template shape,either play with it on it's own or make a second one (or 2)to use the same shape but smaller - think dinner plate, tea plate and cup/mug OR Diameter of my block and half the diameter of my block, if using circles.