It's very nice to see lights all over specially if it's in different colors and symbols, here is a very cheap project that you can even do using scrap materials that you have at home. Salvage those old power supplies and mouse hanging around or those computer speaker systems. The good old LED will be used for the lights and an old power supply for its battery source.

First of all you have to have a volt meter ready for testing, assorted colors of LED, twenty pieces. Look for an IC board from your electronic junk at home. A 220 ohm ¼ watt resister, power supply, soldering gun or iron and solder an old CD and a scrap wood.

Next is make a pattern or design so you will know exactly where the positive and negative side of the battery will go, specially with the LED since it will not light up when it is on the wrong polarity.

By using the voltmeter check if the power supply is producing a correct output voltage after the resistor is placed in series with the LED. Place the LED on the IC board remember a wrong placement will either bust the light or it will not light up.

Cut the pins of the LED, you can use a nail cutter or side cutter, long pins are positive and short one is negative. Solder the pins, use a low wattage iron or gun so it will not be very hot. After all the LEDs, solder also the resistor and the lower the resistance the brighter the light.

You can cut the baby plug on the tip of the power brick and split the two wires. Strip the tips and solder the correct polarity placement. Use an old CD and bore holes on it using a nail or hand drill. Use the block of wood as a base and insert the old CD on the wood use glue to make the CD stand. Now plug in the power supply and you just finished your project.

Source: http://www.instructables.com/id/Light_Up_Smiley_Face_with_reusable_parts...