This simple long pendant necklace is just perfect! And the best part, you can make any figure you'll like :)
To make this necklace, you'll need:
- Some hard plastic, for example an old plastic packaging
- Pins
- Chain and a jump ring
- Glue
- Tools
Prepare the pins by cutting of the sharp part of thee pins with a plier. Make sure you leave no sharp edges.
Also make sure the surface you're working on can handle some spilled glue.
Find out what kind of pattern or figure you want, and lay them as you wish on your surface.
Cut out a piece of the plastic. Then simply glue the pins on to it as you like. Make sure the glue is ment for plastic and metal. 
                                                             

When the glue is dry, take a pin or some other thing that's sharp, and make a hole just over the pendant. Then carefully cut out the pendant with scissors or a knife. Attach the pendant to a jump ring and a chain.

That was simple, right? :)
 
Nautical and simple. I love this!
You'll need an earring like seen over (just remove the thread), one or two nuts and some thin rope. Let's get started!
Take a piece of the rope and tie a knot. Tie it over and over again until it can hold the nut without it falling down. Do this with the other nut as well, if you wish to use two. Now tie the two nuts to the pendant. Take another piece of the rope (log enough to reach over your head) and tie a knot making a big loop. Tie this to the pendant.

That's it!