I recently bought this thrift store skirt & needed a necklace to match.  I made this necklace without buying anything new, just finding things already in my stash.  Here’s how I made it:

I used a beading needle & strung tons of beads onto the string (while keeping the string in one long piece on the roll so I wouldn’t have to guess how long to cut it).  Then I crocheted the string, catching a few beads with each single crochet.  When the necklace was long enough I attached a clasp with crimps.