WARNING: First ask close family members if they'd like the pieces. Even if broken, they may have huge sentimental value to them if they are pieces that may have belonged to a common grandparent or aunt.
Create a new piece of jewelry from some old: Fashion orphaned clip on earrings into a brooch by adding a glue-on pin back. Or turn various broken pieces into a bracelet by gluing them onto bracelet blanks that you can purchase at craft supply stores.
If you have an overwhelming supply of chunky 1950's to 1960's era clip on earrings these are specially great to use in crafts. Use a strong adhesive to glue them around a photo frame or mirror frame. Create a bouquet of old pins, brooches, pendants and earrings.Use an adhesive to glue a strong magnet to the reverse or flat side of old jewelry pieces, turning them into refrigerator magnets.