I used the effect 'Wave' for this photograph, it makes the model look like they are behind frosted glass, although this isn't a very practical filter, I think that it is useful to learn how to use photoshop, which includes filters like this as well as more complicated editing techniques like selective colour.
To do this edit I made a second layer so that it was easy to delete mistakes, I then clicked filters at the top and then I clicked distort, I then clicked wave and this was the final effect from that.
original
