I followed Bud Brewer's tutorial on KHWW.net, for tying 'The Long Pineapple', a turks head knot variation, over a Zebra F-301 Compact Pen. The knot starts with tying a long 4 bight knot, then a second strand is interwoven creating the pineapple knot.
I made the initial knot longer with an extra turn at the start, to cover more of the pen, and figuring out the overs/unders from Bud's tutorial and applying it to the longer knot was easy enough to figure out.
I used 3/32" orange tether cord from County Comm to tie the 4 bight knot, then used 2mm blue nylon cord to interweave the pineapple knot. I tied this one while watching the Auburn vs Mississippi football game, War Eagle!
And a paracord pineapple knot on an EOD Robotics Breacher Bar.