I made use of the "wasteland" poster as the title rather than just the plain Zombieland text. I decolorized the Earth and kept the text colorized on the title. I also decreased the exposure a bit and boosted the hue and saturation of the main cast. Additionally, I created a gradient to fade them into a decolorized version of themselves, which you have to look hard to see. Also the background is fully desaturated.