I've been making a lot of bracelets this week and experimenting with different metals as well :) this Instructable is for a very simple copper cuff, but can be made with any metal.
Step 1: BoM
Metal bracelet blanks
Step 2: Snip & Sand
Snip the edges of the bracelet blank to make them rounder. Sand the edges to prevent cuts.
Step 3: Shape
Place the blank onto the rolling pin, making sure to center it. Use your thumb to bend each end of the blank around the rolling pin. Use your mallet to shape the rest of the bracelet.
Step 4: Hammer
Continue hammering the bracelet on the mallet to harden it. This way the bracelet won't be quite so easy to bend or dent. You don't need to hammer hard and don't do it for too long or you risk the metal becoming brittle.