Step 1: Materials
Needle nose pliers (2 are helpful.)
Jump Rings (Tiny key chain rings) - About 50
Lobster Claw to connect the chain.
Old keys, jewelry, buttons, zipper pulls, Monopoly pieces, and any other junk you can find.
Step 2: Prepare the Chain
Lay out how you want your junk to look on the chain.
Step 3: Attachments
Using the pliers, pull apart the large links on the chain. Slip jump ring though, then clamp link shut with the pliers.
If using a smaller link chain, attach the jump rings directly to it.
I used one piece per link; but added a metal button to links with smaller pieces.