I don't do swatches much anymore, but I do keep scans of my fabrics on my smartphone. I scan the fabric as I bring it home, laying a clear ruler along the edge so I can see the scale in the scan. It's really pretty quick to do. I give the fabric a short descriptive file name and make sure the file names for any flannels start with FL. The scanned files are saved on my computer in a folder called "Fabric" and I try to keep them separated in sub-folders by type or sometimes by project. Periodically I copy the files to my smartphone so I can view them in the photo gallery there. It's a great way to have my inventory at my fingertips and I'll confess sometimes I just browse through the gallery for the joy of looking at the fabric. An additional bonus is that the background on my smartphone is usually the fabric I'm most recently in love with...