1. Cover the walls in mirrors and make an infinity room.
2. If you're not into that, try hanging up a super-cool 3D poster.
3. Or if you really want to step up your game, cover the walls in plants.
4. If you can't afford the real stuff, hang up a poster of a rainforest and play your "sounds of nature" album on loop.
BONUS: Have Jumanji playing on the TV at all times.