I was using a faux 30's quilt block picture as my avatar. The pic I saved from their website. I was recently asked to remove it for these same reasons. And I hadn't even sewn a block yet, just used their picture.
Also I've been on some websites that when I right click my mouse to save the picture I got a pop-up saying function not available. So it's not just making a quilt for selling, you can't use their picture either.