I found it helpful to look for neon signs for inspiration, but feel free to come up with your own design. It could look cool if you paint over the sign with glow in the dark paint, or you could add an LED strip to the edge of your canvas. I tried it on white paper, but it doesn’t give you the right shine like a real neon sign. However, you could try adding the same color pencil shading as you.
I thought it would be cute to make one of those “on air” signs you see on a radio or TV station.