To start with open your picture... for this I chose a day scene (but any will do)
NOTE: if there are people in the scene they must be isolated and colored separately.
Now go to [Image > Adjustments > Gradient Map...]
Make yourself a new gradient that looks something like this...
NOTE: Keep in mind that you might have to play with this the most... till you get the look you want.
Now it should look like this:
Next through in a "mild" Gaussian Bur... [Filter > Bur > Gaussian Bur...]
Then add some noise... [Filter > Noise > Add Noise...]
And you will get something like this...
Well that's it for now... not the hardst thing but it is my first tutorial so I thought I would keep it simple...