For example, I made this lollipop necklace when they were popular (I guess that's my throwback Thursday), and today, I'm using the chain from that necklace for something new.
To start, I put a metallic initial bead (my first initial is "s") on an eye pin, as shown.
Then, I threaded the pin through the loop end of the chain.
I cut off the excess of the pin and wrapped it around to secure it in place. The eye of the pin now serves as part of the necklace closure.