So all the Batman fans out there know that if you need Batmans help then you need a bat symbol to get his attention. So lucky for you I have played around with a few ideas and have found a simple and quick solution.
Thin Cardboard such as a cereal box
Black sharpie (Optional)
Access to the internet and printer
A dark room or closet
Step 1: Find a symbol template
So use google to look up picture of bat symbol or bat symbol templates. I found one, tested out a few sizes and printed it just to make sure. Play around with image sizes in a software such as Microsoft Word. I will attach my document to this step if you would like to try any of those.
Step 2: Cut Out the Template and trace
Once you have a good size you can go ahead and print it out, just plain black and white is fine as long as you can still see the symbol. I had a little bit of a hard time with the gray and black being too similar when printed out my template in black and white, so I reccommend printing something like that in color.
Step 3: Cut out the symbol
Now that you have the template, you need to cut it out. I would take your time or you may end up cutting off some details in the process.
Step 4: Trace onto the cardboard
This is where I strongly recommend the thin cardboard because it might not fit inside the flashlight if it's too thick. If you need to, you can color in the symbol with black so that it has a better effect when the flashlight is turned on.
Step 5: Cut out the cardboard
We're almost done! Now what you need to do is cut out your cardboard symbol and go over it in black sharpie if you haven't already. You've almost got your complete bat symbol flashlight!