-1 Solar powered garden light (I bought one of these for $4.88 at the register http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?jspStoreDir=hdus&catalogId=10053&productId=202080419&navFlow=3&keyword=873046003508
included was a rechargeable battery, a solar panel, and an led.
-4 Recycled key chain leds (or plain leds http://www.radioshack.com/product/index.jsp?productId=3060980 $3.98
-1 Toggle Switch http://www.radioshack.com/product/index.jsp?productId=2062497 $3
-Altoids candy $3 (I used a switch from an older diy project)
-Rare earth magnets (optional)
-Wire (you should have this already)
-Electrical tape (you should have this already as well)
Total Price using recycled parts = free
Total gross price = $14.86
-Brass sponge (optional)
-Dremel (you can use a drill if you don't have one)
-Hot glue gun
-Wire cutter / stripper
Step 1: Freeze the Altoids
This makes it so when you drill holes in it, it does not dent the can.