As a kid who used to have glow-in-the-dark star stickers plastered all over my walls and ceiling — as well as large and gaudy planet stickers, too — I can immediately see the appeal of this Rainbow Stone. While my stickers inspired dreams of beinga starship pilot, battling off humanity's latest threats, the Rainbow Stone looks like it will appeal to more tranquil imaginations. An array of colored LEDs on the inside shine on a mirror, reflecting an arc of color onto whatever surface it's pointed at.

What you're left with is a colorful display for you or the kids and, depending on how much light it puts out, maybe a nightlight to boot. Unfortunately, it looks like the Rainbow Stone is only being sold in Korea for the equivalent of about $40. — Kevin Hall

Gadget8, via Technabob