Here are the results of my experimenting with corner bookmarks. The first is a cross-stitch version from Cross Country Stitching magazine. At one time you could buy these pre-finished. I never did that, but I figured it wouldn't be too difficult to make one. I didn't have lace for the hem, so I just did a quick machine-stitched hem. A bit crooked, but I was tired and in a hurry to see how it would work.
Next I once again felt the pull of crochet. I worked up a cute little corner bookmark dress. I think it's very sweet. Instructions are here.