The Urban Decay Pack 1 mod for Cities Skylines 2, created by modder rzzirrah, aims to introduce realism to the game's overly pristine aesthetic. This mod includes three ground decals featuring cracked pavements and potholes, sixteen wall decors, two net lanes, and three surface textures. A follow-up, Urban Decay Pack 2, adds random decals, rusty roofs, and elements like torn posters and leaking pipes to enhance the urban decay aesthetic. The mod has gained popularity on the Paradox Plaza forum since its launch last month.