Need a nightlight but have no intention of polluting your otherwise clean hallway with a gaudy gadget sticking out of a socket? Try SnapRays Guidelight instead. This plug-and-play wall socket cover replacement installs in seconds — no fiddling around with wires required — and packs a light sensor along with three downward-facing LEDs. Come night, the lights turn on to give a base level of visibility in a hallway, kitchen, bathroom, or other socket-equipped room. Best of all its LEDs are incredibly efficient, rated for 25+ years of use, at a price of about 5 cents per year per guide light in electricity.