I find myself using the crown and wall all the time...maybe even too much. But it is easy, durable, integral, and looks great I think.
Short tutorial here:
http://forums.outdoors-magazine.com/viewtopic.php?t=1103
More extensive tutorial here:
http://www.knifenetwork.com/forum/showthread.php?t=11384&highlight=braid
I have been reading a knot book over the weekend and I think I have been calling the crown the wall and the wall the crown but together they are a crown and wall knot....
If this terminator knot is not large enough for your lanyard terminations it can be covered with a cowboy knot woven over it. This will make a nice ball termination.
So for a handle down woodlore type sheath, I would braid a 6-plait cord just long enough to place the sheath right where I wanted it to be, and then join the braid together in 8-plait braid (drop 4 strings into middle as core), thread thisthong through the carry hole in the sheath, then do a crown and wall. The knife would never be easily removable from this though, and it is on one point of suspension which would twist probably.
If you wanted removable I would braid a loop on the sheath, and then braid a neck thong with a large terminator ball on the end then force the ball through the loop on the sheath. Of course this is hard to get both loop and ball sized properly and securely.
There are probably tons of other ways to go about this too, but I would try hard to figure out a connection that prevented the sheath from moving or twisting...I hate that.