Post-apocalyptic house (preferably inside/interior)

[Sangrealle]

Hello!
I have tried digging up some post-apocalyptic stuff (specifically: post-apocalyptic houses) on Wallpaper Engine: but cannot find any that I really like. So, I tried to fix up something myself. I am very new at this however, so I am not very good at it (yet). Hopefully some of you could help me out?

This picture[conceptartworld.com] is my favourite so far. I tried adding some God Rays and adjusting some particle effects (making it look like dust particles in sunlight). If someone could do something along the lines of that (simple dust particles) it would be absolutely amazing!
Alternatively, if you have any great ideas I would love to see it.

Tldr; add simple 'dust particles' to linked picture. Preferably slow-moving, greyish, and subtle. Preferably, particles are located in the middle and to the right of the picture (the two windows)

Thanks!

EDIT: The particles I liked and found most suiting were "Particle Systems" with some adjustments (change of size, colour, speed, velocity, gravity). But if anyone thinks something else would look better, I am all ears/eyes!

[ArgRIB]

It's always hard to add something to a already perfect picture.
I didn't did much more than particles and light. To add much more whould destroy the feeling.

http://steamcommunity.com/sharedfiles/filedetails/?id=1206327184

[Sangrealle]

Looks amazing! Is there any way to remove particles and effects that goes outside of the picture itself?

[ArgRIB]

I can give it a try, but it's not as easy as it may sound :D

[ArgRIB]

HA! Did that. I just added a black layer in front of that particles. (yeah, I know, what a lazy trick, but it works.) I updated the wallpaper, shuld be fine now.