These are similar techniques, but I think it´s much simpler:
- choose a pattern with a even number of the same colour (I mean there have to be always at least 2 (or 4 or 6) threads of every colour
- cut them not as single, but double threads (for 2 threads of 90 cm, cut 1 thread of 180 cm)
- chose the colour of the loop and make the thread of this colour longer than the others
- fold the threads in half
- in the middle, wrap the longer thread tightly around the others to make the loop
I made a drawing, it´s a bit basic, but I hope it helps:

I haven´t tried this myself, I think the problem could be that it unwraps itself easily, maybe you have to make some knots at the beginng and the end of the loop to prevent this.