How Can I Add Visuals On The TV Behind Our DJ Booth?

“Digital DJ Tips forum reader EpicDJ writes: “OK, so next weekend friends and I are throwing a ‘Naughty School Girl’ back to school party at his condo. We are going to be setting me up in front of the LCD TV that is on the wall, and were thinking it would be cool to have some type of visuals going in the background on the TV, or even perhaps, a mirror of my screen via the Apple TV?"