Old quilts and tops just seem to jump to me! My kiddos always said that I purchased the ugliest in the batch..not so, I call them unique. Unusual color combos or fabrics really catch my eye. I wish they all came with their story attached. I use to tell kiddos somebody's Mama made this to keep her family warm and that alone makes it valuable to me.
Newer things I look at stitching, points, etc but that doesn't stop me from buying something that is appealing. It is usually just for inspiration and in admiration for the talent and patience involved. No judgement at all!