These plain choker necklaces are available at most craft stores. Instead of using them the intended way (with the closure in the back) I kept it open and turned it around to the front. I think it makes it a little more interesting than your basic necklace.
|[Open the jump ring and string on some chains]|
|[Close the jump ring over the choker]|
|[Repeat on the other side]|
|[Attach the spikes with jump rings to the ends of the chains]|