Crocheted cord, in one or two colors. Chain stitches alone stretch out very quickly, though. I also use this cord, for example, for keychains.
It is started with 3 chain stitches around the key ring. (Crochet the starting yarn into the loops.) These chain stitches are then worked off
one by one. *Slip the last two stitches off the crochet hook (hold the stitches) and crochet the first chain stitch.
Place the second chain stitch back on the hook, crochet this chain stitch (there are now 2 chain stitches on the hook), place the third chain stitch on the hook, and crochet only this one with a chain stitch. (There are now 3 chain stitches on the hook again.)*
There are now 3 chain stitches on the hook again, and you now repeat from * to *.
You can also crochet over two or more chain stitches, depending on how many chain stitches you crochet into the key ring. .
A two-color variation:
Work in a second contrasting yarn. Crochet the chain stitches as usual, placing the contrasting yarn on the hook and
crocheting it in.
The yarn can also be worked into the variation described above by placing it in front of the last chain stitch.