Polymer Clay Express holds monthly contests, many of which are suitable for jewelry designers. Their only stipulation for entering the contests is that the designs must be made of polymer clay (with other added materials for embellishments accepted.)
Their contest for October is called "That Really Bugs Me," which should really suit designs that will be appropriate for Halloween, which is just around the corner.
The accept photographic entries now, and the deadline for submissions is October 17. You can view the contest entries on the Polymer Clay Express website. I'll post some of the winning designs when they are announced next month.
If you love halloween jewelry but aren't in the mood for polymer clay, here are a few cute rhinestone Halloween jewelry ideas to put you in a spooky mood. They are available from my Carolina Collections Vintage Jewelry store on ebay. Prices start at $10.25.