I'd say: Bokeh and flat borders (w/o filling) work well. But you should restrict the use to headers and featured elements.

Update (sorry, I was in a rush and forgot to paste the rest of the answer):

As an example, we can take the following header:
![dribbble shot #848287][1]


Despite of the strong bokeh, the thin lines of the logo + the hr are not too aggressive and fit well. A filling would not work the good (it would cover too much of the photo).

Another example:
![from @KinaoleCanada][2]


  [1]: https://i.sstatic.net/bUEBc.jpg
  [2]: https://i.sstatic.net/1vmp9.jpg