I made a hat band that goes around my boonie hat, that has at least 25 feet of paracord.

The other application that I have found works great is a slightly different knot that gives you the ability to wrap about 10 feet of paracord around a small ferrocerium rod and striker. I also wrapped about 3 feet of snare wire around that before knotting the FOB.

It took me a little looking to find a video on how to tie the knot, but this makes a very handy little EDC item and is the perfect size for a keychain.