My fabric hording (strike that - collection/stashing) habit is somewhat organized. I see something I really love, I decide how much I love it. Love enough for piecing, OBW, borders or perhaps a background, and buy yardage accordingly. I keep a swatch in a small photo album, (have several) which I carry with on shopping trips. Matching, coordinating, and contrasting, until I have what I feel are compatible and sufficient fabrics for a quilt. I began doing that when I wanted to make a quilt with a much loved fabric, and couldn't find what I wanted to balance the colors, at home, or in my local stores. When I store the fabrics, they are by intended projects. When there is an opportunity to attend a retreat, or an out of town trip, I can just grab a stack of fabric and go.