Have you ever taken pictures that turned out badly?  . . . the subject was fine, but the lighting was almost non-existent?  
Filters can really make the difference!  I took these shots of Emma today without a flash and the photos were so dark, you couldn't recognise them.
 
First thing I did was use a 
Screen blending mode in 
Photoshop - about 7 or 8 times to lighten the picture so you could see it.  Then I went to 
Virtual Photographer, (free filters) and scrolled through the list until I saw one I liked.  I chose a 
faded filter.  

Then I opened up some 
Totally Rad Actions and applied 
Boutwell's Magic Glasses, which sharpens and lightens the image. (You can get a free sampler pack from Totally Rad Actions)

To another photo I used  both Totally Rad's 
Troy and 
SuperFun Happy.  The effects are very different, but you can see that "garbage" photos can be salvaged with a little experimentation.  By the way, my fav is the first one.  It seems to convey the sleepy snoozy feeling quite well.