Just like "Goodby.....". Make a rusty, or a dark skin fo the same wep. Stalker have a Post-apocaliptic structure. Make it rusty for radiation, or in other case, change the tone of the colours. They are very shiny. Yeah, the AWP is awesome and it deserve to be new like in a shop. But in stalker you can found it in a stash.
P.D: Try to see how it feel with Atmofear. The change of colour tone is smashing to that green.