Pre-printed wholecloth designs are usually offered on white or cream fabric, as you've found out. An option would be to purchase a paper pattern that you then transfer the design yourself to your chosen fabric. You will need a lightbox with a strong enough light to show through the fabric. Darkening the design with a Sharpie can help with the tracing. Use a blue water-erase pen for the marking so the lines don't fade. Then after quilting the marks are soaked to remove. That's quite a hand-quilting project---I love the French boutis quilts. Usually made of one fabric and beautiful!