Just curious to have a try at it. Here's an all-Xtreme version with three different layers (the right and left clouds have two different brightness/contrast settings applied to them, and those settings are much different than the building settings). Doing this will require more time than I put into it, because the clipview edge takes a little effort to blend correctly.

BUT. This effect can be achieved in almost any photo manipulation package (including the free Gimp, if I'm not mistaken). And some (like Photoshop) have many more filters than Xtreme, such as color balance. (At least I don't think it's included in 6.0.)

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