I don't buy ugly fabrics, so I don't think I could make an ugly quilt, but I may be wrong! I think it must be with the ugly fabric choices, but I have read here about fabric shrinking at different rates, poor piecing and poor quilting that made ugly quilts. Also, with pairing up fabrics that don't go together, like a dark green, orange and pink, just off the top of my head. But those combinations may be pretty to someone!