Spent an hour the other night making stitchmarkers with beads and cord.
They are very simple to make:
Carefully melt the end of the cord with a lighter, quickly form the end of the cord to a tapered end with wet fingers.
Place all the beads for one stitch marker on the cord: ----oOooOo--------------
Make a knot on one end: ----oOooOo----------&
melt the end of the cord after the knot to a small ball of nylon.
Cut the cord to the lenght you want, remember that the middle knot and the end knot will "eat" some of the cord length.
Make a knot on the other end: &-------oOooOo----------&
melt the end like you did with the first knot.
Now divide the beads to two sides: &oOo--------------------oOo&
Fold the cord in half and make a knot for the loop: