Here's the first one I actually made with a decorative stopper after someone suggested I try; its the double matthew walker knot. I like this knot (lower right in photo) and use it to end my firesteel paracord sheath, and to end my alice pack paracord handle; it is solid and just a perfect 'bump in the road' to prevent loss of the loop through the manrope knot. This is also the first I braided spiral rather than diamond on the 4-strand round braid: