Imagine if you are decorating and want a certain color scheme in a room. You can take one of your photos and change it up. If you prefer a SOOC look, this wouldn't be for you. But if you like the subject of a photo and it doesn't look quite right in a spot you've chosen, this might be right down your alley.
As long as you have kept your original intact and are working from copies in your editing program, you won't lose anything. It's like a box of crayons....pull out your favorites and color the picture.