just like the flood light in all the batman movies u can make one too with the batman logo or your own custom logo

Step 1: Needed Materials =P

Sticker paper (easily found at any computer or office stores)
scissors
any type of bottle ( i used nos energy drink bc its kool)
hot glue gun
glue sticks for hot glue gun
exacto knife( have ur parents help if u need it for safety)
pen or pencil
led light( you can buy one or make one)
creativity =]

Step 2: Cutting Bottle

carefully cutt the bottom oof the bottle. this is where u will put your batman signal or custom logo

Step 3: Cutting Hole in Cap, Placin Led in Hole

carefully with adult supervision use scissors to punch a hole in the top of cap for led light placement. hot glue led into the hole. screw cap back on bottle

Step 4: Signal Stencil

trace the bottom of ur bottle so you have guide lines and draw your batman signal on your sticker paper inside the circle you just drew and cutt out with and exacto knife and place on the bottom neatly( i was in a rush so mine looks sloppy) cutt out extra space outside the circle you drew so that you can have enough sticker paper to put on the bottle