This thing is being printed right now. Will add photos later. It can be opened and closed, these parts fit perfectly in each other. The colored elements can be glued onto the front part with super glue.
When you resize the STLs, make sure that the colored parts are about 0.8-1mm thick (z) so that they are not too thin, letting too much light through, and not too thick, blocking the light.
Feel free to remix it to make it better. I also added a back part with a small hole, in case you want to let out a wire to a socket.