All you need to add is a battery.
Kyouei Design’s Bookmark Light will turn into an ultra-compact reading light.

ultra thin bookmark + reading light

Available from Designboom’s online shop for just $16, the flexible bookmark is covered in a simple circuit made from conductive ink, as well as a set of ultra-thin LEDs. When folded over a standard CR2032 watch-sized battery, the LEDs glow, letting you read well into the night.

bookmark reading light designboom

The LED emits light when the lithium coin battery CR2032 is used for this bookmark. A circuit is printed by the ink in which the silver of a nano sized particle is included on the special film used for liquid crystal.

I want one now! 🙂