Photo effects can really create dynamic changes to apparently static images, look at the following screenshots:

In the above screen shot you can see the sepia effect, the postcard effect, the colored outline effect, the clouds effect, the lightening in odd places effect, the ditisies frame effect, the cubist effect, the rainbow effect and, just about, the Paul Klee effect.

In the screenshot above you can see the clouds effect, the old film effect, the emergence effect, the Warhol effect, and the snow effect (applied as a frame or vignette).

This screen shot shows how easy it is to make a vignette using an effect mixed with an original image. As you can see from the dialog the effect is "tinted negative", and it is being mixed as an elliptical vignette with the original photo.

In all the program has 120 Effects, and the home page is here.