Scraplady, as evryone said you make them with anything.
However, the scrub fabric will not fray the same as cotton or flannel but if it;s simply to teach then you might not mind.
You can also use for the centre instead of batting any stiffer fabric that would not move around; a felt type of fabric a decorator fabric... remember how heavy you want it. As a beginner, flannel on the back for softness and scrub on the front for prints would be a nice light quilt.
Hope this helps
Carole