These blue canary night lights are now commercially produced. The translucent blue canary sits atop an LED night light base with a sensor eye, which uses only about $0.25 worth of electricity per year. The light dims and brightens as the ambient light brightens and dims.
Anfani LLC has a solid reputation for making and selling these night lights, and has been doing so for over a year now.
Lights are individually packaged in a minimal amount of bubble wrap, and recycle-able cardboard boxes.
NOTE: Please be aware that I am able to make night lights that look like this using a white LED bulb. I could not have done so using replaceable incandescent bulbs. The upside is that they use very little electricity. The downside is that the light will slowly dim over time, generally 2-3 years. This is normal for LED bulbs and is to be expected. I wish they would not dim, but until the technology improves this is the best option available.
Sensor night light
Translucent blue canary