Sometimes the foreground object isn’t the only subject of the photo. In the following shots the background was what I really cared about capturing. The foreground is a supporting actor.
When using this technique I sometimes like very soft focus on my real subject. Macro mode helps with that. You can also use our Bokeh software to soften the background.
Here is a set of photos that use this technique to varying degrees. It is hard to get just right. In the best case the foreground helps tell a story about the background.