This the famous Las Vegas Sign illuminated by a coloured fairy light. The lid can easily be installed by pressing it onto the box. The tolerances are quite big for easy installation. For the fairy light there is a little frame and a hole for switching it on and off. I colored the parts with simple acrylic markers.
I bought a cheap battery powered fairy light with coloured LEDs from a local store to put inside. The box may need a little adjustment to accomodate your fairy light.
The sign itself is remixed from Dylan K's model.
The author remixed this model.
I took the “LAS VEGAS SIGN (UPDATE) - Remix” files and modeled a box around ist so I could fit fairy lights in it. The lights shine through the relativeliy thin walls.