A Cloudy Solution
Because I couldn't find much online, I undertook a bit of experimenting and discovered a new (perhaps intended?) use for the 'Clouds' command
The top shot features over-exposed blown out clouds, and so it makes a (admittedly pretty average) shot unusable.
In the bottom correction, I selected all bits that were in the pure white range (done by adjusting the sensitivity of the magic wand to include the slightly off-whites as well).
Next to filter>render>clouds. Copy the result, undo it and the selection, then paste in place.
I increased contrast and added some noise,. how much is dependent on how much you feel like, but fifty to a hundred should do. This is to fill in the gaps a little.
I then Gaussian blurred a bit, and set the opacity to 30 percent, fiddling to get it to feel like a close blend.
Finally I sepia-toned it, and shifted hue to 180, and pushed saturation to 100 percent.
Violins and violas!