In this picture you can see that the CSS Computer has been reskinned with a black keyboard and a high-tech case. The monitor says KOS i think..which is part of the reskin https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1333168888 In this 2nd screenshot you can see that the map reskinned this roof prop with green/red colors. The default color is Blue and Red. https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1333170312 In this 3rd screenshot you can see that the map also reskinned this Trashcan(maybe) and in the spawnmenu icon of this prop it has a DarkGreen color and High Quality Textures. But in this map it shows the trashcan as Low-Res and not Darkgreen. (I have all my graphic settings set to high)
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1333168428 This map also reskins the red brick texture to a grey/gray brown-ish faded look. For example the building in gm_construct will now have the faded out brick texture due to this map. (I didn't take a screenshot of the brick texture so you have to see it yourself)