Alright, I know its been a while since my last update on this but here is one of my latest tricks:
How to make dust or a mist area:
To start with download a cloud brush pack and then of course add them into the directory(see below on how to do that). then select a cloud brush that you want to use and then select the following features for either the brush or air brush, jitter and set to max, the incremental option comes on automatically and then the color gradient, firstly on this choose colors that would look good together so they can complement each other. Also, I suggest that you turn down the Opacity, that means the transparency of the color that you are applying with the utensil, and by doing so the natural shape of the cloud and the color gradient and the jitter will spread out a small spectrum of colored clouds and make it look like a dust cloud or cloudy area of the image. also, adjusting the size is a must, now I am not saying you have to use the same size of brush all the time but if you apply different sizes of the brush finer details can be added such as definition to the actual cloud that the color gradient doesn't add. See below for examples of the above trick:



Now also, this trick can be applied to other subjects besides clouds, like snow for instance:

Now I will say this, if anyone plans on following on how to make the line backgrounds the follow will be a Tip & Trick below:
To begin with make a new image, to your specification and then go to filters\render\line nova and then type in 40 lines, 3 degrees, 20-35 off set and 1 random. This is generally what I use for line nova. Now it will give you more lines that what show up in my images but that's because I use the Fuzzy Tool or the "U" shortcut and select every other line, now you want to have an even number of lines to that you don't have to big of a gap in between each line, also when you use the fuzzy tool enable the multiple selection feature, it'll be a little button just below where you select the colors that you want to use and it'll be shown as 2 red squares overlapping each other, then using that feature go every each other line and then go to another layer and use what ever color that you want with either the bucket(shift+b), paint brush(P), pen(n) or air brush, it's up to you what you use but all give the same general outcome. Then make the back ground another color and then you have the makings of the style of background that I use. Also to add the extra detail in the lines that the line nova made and that you selected make a new layer and choose a brush that you want to use and use the features, jitter(max) and color gradient and then just cover the entire area after you have reselected all of the lines, here's a easy way to do that, select the gap between a set of lines and that'll give you over half of the image selected then go to select\invert and then it will select the lines instead, then go and using whatever utensil you choose, cover the entire area with what ever brush that you choose, now it doesn't just have to be just one brush but it can be multiple as well, up to you. The same goes with the solid background color layer that you made before but no selection is required for this layer. Now when you are satisfied with the amount of brushes you have put on the layer then try and see what layer effects blend the layers to your liking. And that right there is generally what I do to make the beginning of my wallpapers.
If there is any question's on the process that I just explained the please be my guest and leave your question and I'll answer it as soon as I can.
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Also, you can follow the progress on my works here:
http://s319.photobucket.com/albums/mm446/ncgcgenrave/ so please don't be afraid to stop by and see what other tricks I have come up with but haven't posted on yet!
Till the next update, Laters!