I've made two bight Turk's Head knots before, but hadn't tried it following the description in The Ashley Book of Knots, ABoK knot #595. It recommends using a straw or rolled up piece of paper to stick one end of the cord through, then tie the two bight Turk's Head over that with the rest of your cord. I used the tubular section from a bic ball point pen for this, instead of a straw or paper.
The odd number of leads to make for this Turk's Head knot is up to you, depending on how long you want your lanyard to be.
I used a 5 foot length of green 550 paracord and made two passes for a 13 lead 2 bight Turk's Head knot. I then removed the pen section and used my hemostats to pull the working end through the knot alongside the cord section that was inside. I worked the slack out of the knot, tightening it up over the two strands of the core. I had to work the cord back and forth a bit to even out the strands coming out the end of the knot.
After I had the Turk's Head tightened up, I tied a lanyard knot with the end strands, then pulled one strand back out of the lanyard knot and followed it with the other, to create a loop on that end making another attachment point, so it works as an actual lanyard instead of just a decorative fob.
The first few photos of this tutorial on the KHWW site, show a 2 bight Turk's Head being tied, for those that don't have the ABoK.