I made this before I made the instructable, so it might not be clear.
If you want me to start selling them on ebay, let me know.
Step 1: Get your legos
-a 2x6 lego brick
-a 2x6 matching lego panel
-small flexible insulated wire
-1 superbright LED (white is nice, but you can get a color to match a brick)
-a switch (i used a small toggle switch from RadioShak)
-3 LR1130 button cell batteries.
-needle nose pliers
-something to make the holes in the plastic for the LED and toggle switch