I used about 15 feet of tan 1.4mm braided nylon cord, to tie a long 4 bight turks head knot(45L4B), over a doubled up 3 foot length of coyote tan paracord. The paracord is attached to a swivel clip with a cat's paw knot at one end, and a small split ring secured by snake knots at the other end.
The stainless steel rigging knife has a marlin spike, blade, screwdriver, lanyard loop/bail,and shackle key.
Tying the knot around a drinking straw as a mandrel first, is easier than tying it around the paracord. I doubled up the 1.4mm cord when tying the knot to only make one pass.
The bracelet version is a 61 lead 4 bight turks head knot, using less than 20 feet of 1.4mm tan/gray nylon cord, with paracord for the core and a 3/8" side release buckle. You can just see where I've used the hemostats to pull the paracord ends back through some of the knot work to secure them, and I'll trim and tuck those to finish.
Here's the finished long 4 bight turks head knot bracelet shown next to a regular paracord bracelet. And a couple more that I made with a some different colors I have of the 1.4mm nylon cord, with the knots spaced out a bit to see the paracord underneath, black paracord under the darker tan, and coyote tan under the off white.
Another larger one was made with a 4 strand paracord core and a 5/8" side release buckle. I put two drinking straws side-by-side, with rubber bands on the ends to hold them together, when tying the long 4 bight knot around them, before pulling the paracord through. I was hoping to get the 4 strands to lay flat in a row with the turks head knot over them, but they end up getting bunched up. I was thinking of a possible watchband version, but done with separated turks head knots on both sides of the watch, between the buckle ends, with the paracord running underneath the watch. Maybe tying the knots around nylon webbing, or just over an existing watchband would work better...
Here's a link to a blog post from September 2009, of a 2 bight lanyard tutorial and a 2 bight paracord bracelet that I made last year. The 4 bight knots start off as 2 bight knots. ;)