What a cool steampunk mononcle! Instructables.com has a detailed 13-step tutorial on how to make one yourself.

Like with any other project, we need to start somewhere. Usually I start sketching my ideas, to have some kind of blueprint to follow. This time I decide to do everything following only my creative talent (if we can call it a talent).

Materials needed:
- a 1.5 liter plastic bottle, the harder the better;
- an old leather purse (true or fake, no matter), ready to be dismantled;
- all-purpose glue, like mastic;
- an old pocket watch, not precious, not working and not reparable (maybe also not yours…);
- a piece of cardboard;
- a sheet of transparent plastic;
- elastic;
- 2 small metal hangers;
- gold, copper or bronze permanent marker;
- some uninsulated copper wire, medium thickness.
Instead of a purse and a watch you can use any kind of leather object big enough to provide the required amount of material, and any other mechanical device that can be reduced to a lot of cogs.
The copper wire should be uninsulated for showing the color. If you have a wire with transparent insulation, it will preserve the natural color of copper, otherwise it can develop an ugly oxide patina.

Optional materials:
- acrylic paint, any color you like;
- fixative or transparent varnish.
The paint is needed only if the leather’s color is wrong for your intentions. For a steampunkish style, you can use black, dark brown, dark bordeaux, anthracite or wet sand color paint. It’s up only to you.

Very impressive! Visit Instructables.com to view the full tutorial.