I've used curtain fabric for children's quilts intended for playing, picnics, car travel, etc., rather than for bedding. It makes tough little quilts, that seem to wash well. I open the seams, and back with fleece rather than using batting and a backing fabric. My local home decor shops often give away sample (small) curtains that are intended for shop display, at the end of the season, and I unpick these, and two will make a small quilt.