Some Cycles nodes for a neat blue neon material with a few notes scribbled on. I used RGB curves node to control intensity over the surface from inside to outside, but a color ramp node with grayscale can likely do the same thing. That intensity falloff thing helps the glass part catch any glints and develop a few highlights from the neon itself. Hard to explain, other than messing around with settings and seeing how it works. I think it looks nice for what it is.
