I spotted these neon earrings by Miso at Republic the other day. Unfortunately, they don't seem to fare well on camera, as none of these images correctly portray how bright they really are. Both designs come in neon pink and neon yellow, and are very affordable. Alternatively, if you have some old earrings lying around the house, why not paint the rhinestones neon with nail polish, or dip the chains in neon paint?
The chandelier earrings are available here and the chain ones are available here.