art glass (from a glass supply store) copper tape (from a glass supply store) a glass cutter (from a glass supply store) pliers (glass pliers are best but you can substitute regular pliers and coat the tips with rubber like the ones below) solder flux soldering iron soda can
tiny wires, preferably two different colors ATTiny45 chip (code attached*) (Digikey #ATTiny45v-10SU-ND) LED (Digikey #160-1423-1-ND) tiny switch CR2016-1F2 battery (Digikey #P222-ND) (Really, any 3v battery will do. This one was chosen for form factor.
*Getting the code on the chip could be its own Instructable. When I am a microcontroller guru someday I will post on how to do that.