Heres the dust-trough-lightbeam tutorial, as promised:
(Using imageshack for this one, so images may be a bit slower than usual)
Stuff to do in photoshop:
Open your lightbeam texture in Photoshop (see previous entry about lightbeams for a "how to make lightbeam" tutorial).
Select a slightly brighter/stronger color (with the same hue) than your lightbeam is at this moment in either primary or secondary color. On the other one (primary/secondary color) pick a darker/weaker color (with the same hue) as your lightbeam color.
Select background layer (or create a new, doesnt matter) and go to Filter>Render>Clouds and your should get something that looks like this.
Save as TGA with alphachannel box ticked.
Stuff to do in Unrealed:
Import the file you just made in photoshop and tick the Alphachannel box. In the texture browser, select file>new and you get the window you see below, with the exception that where it says "class.engine.texpanner" for me it says "class.engine.shader" for you.
Mypackage: Mylevel
Group: Light (or whatever)
Name: Your moms maiden name
Click the arrow to the right of where it says "class.engine.shader" and scroll down "class.engine.texpanner".
Press "new" button.
Right, so now a new window pops up. Looks like this:
Plenty of options in there but the only one we need for this tutorial is the "Material" tab at the very bottom and the "panrate" tab.
Select the texture you created and imported earlier, and press "use" in the material tab ("use" pops up if you select the tab). You should see the texture you created imported before pan across the left window.
Adjust how fast it pans, or in this case "blows", by adjusting the "panrate" tab untill you have a result you're happy with. When you're done just close the window by pressing X at the topright of the window.
Then just have the new texpan shader selected in the texture browser and press "use" in the static mesh properties>display>skin tab
Boom! Done!
As with everything you can get awesome results if you handpaint the texture rather than randomly generate clouds but this is a quick way to add ambience and life to your enviorment.