Find your blank slate - I found this giant mirror. It was ugggglyyyyy. But I made it sweet. NO BIG DEAL.
Remove the mirror and go nuts.
Buy plastic guns and bullets and other fun zombie-related stuff and paint them to look a little more real. No orange caps! Glue them on with some super strong glue.
Admire your amazing creation. My mirror was splattered with blood, but I accidentally broke it. Huge mess. I don't recommanding breaking anything of yours. It's pretty disappointing. Lol. Now it's a frame...I need to get a mirror for it!