The Flashing Light Prize 2018
Entries can be found on YouTube (search for "Flashing Light Prize 2018")
To get neon gas to glow requires high voltages, radio frequency energy and/or other dangerous things. Moreover, any glass vessel containing the neon could shatter and cause injury. Do not attempt to build anything for this contest unless you have the necessary skills, knowledge and safety equipment. The Flashing Light Prize and its organisers accept no responsibility for any injury or loss howsoever caused.