Not Waiting for the Weather
There are two situations I can think 
of where “digitally” adding green grass to an otherwise brown front yard makes sense: 1) early Spring, after the snow has melted but before lawns have “greened up”; and 2) new construction, where earth-moving equipment has trampled the yard, and the developer has 
yet to put everything back together.
As you can see from these “before” and “after” shots . . . the difference can be dramatic!
P.S.: Another popular technique: digitally substituting a blue sky for an overcast one.
