I did this small project in about 2 hours for my cousin who turned 3. He loved and everyone else who as at the party like it as well
Step 1: Find Your Wood
First you want to find a piece big enough, this all depends on how big you want it
Step 2: Draw
Your going to want to tape it down a
Step 3: Cutting It Out
I used a Jig Saw to cut it out because that is what i had accesses to at the time.
Step 4: Add the Lights and Back
I used little spacers to make space to but the lights behind the batman symbol to make it pop and look good. the back i just pre-drilled holes the screwed little screws in
Step 5: Finally Spray Paint
I sprayed it black because it batman and when its dark the symbol pops out more then a lighter color.
Step 6: Sit Back and Enjoy It :)