There are plenty of Star Wars gadgets and gizmos money can buy. You can also build your own if you are into DIY projects. Take this motorized R2-D2 hat for instance. It comes with lights and motion to let you put on a show at cosplay events.
You are going to need an Arduino UNO, LEDs, a servo, and a few basic components to complete this. lewisb42 has shared the instructions for this project here.