They come in many different sizes. So some of them are great for pincushions. In the finishing process, you can sew a ribbon into your seam so it can hang as an ornament. Like so many other things in stitching, they are meant to be pretty and bring pleasure. A bowl full them is beautiful. Just like we frame and hang large stitched pieces on the wall, the small ones are for display on a corner table, in a hutch, etc.
Biscornu - its just cute handy stuff for needlework or embroidery. All needles are in one place, at hand. Moreover, embroidered biscorna pleases the eye. At me, the truth, the cat drags needles from this biscornu.