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It looks to me as if you could make those in no-time using Filter->Render->Clouds and Filter->Render->Lighning Effects
If you want to make backdrops looking like draped cloth you need to know how different cloth folds and then create them manually. I have tried that a couple of times.
A simple answer to creating backgrounds is to pick two complementary colors of differing brightness values and use Filter > Render > Clouds (A). Then, if you wish to add a texture, you could use Filter > Texture > Texturizer. In the Texturizer you can load any grayscale .psd image and adjust the scale, relief and light direction. If you installed all the presets when you installed PS, there are many files you can use with the Texturizer found in Presets > Textures for Lighting Effects. You can also make one as I did in the little image 4. I just made a quick dark gray/white gradient, blurred it a bit and loaded it as my texture map. You load a texture by clicking on the little button which I've pointed out and then navigating to the image file you wish to use.
In addition to backgrounds, lighting of images is very important. We recently had a thread on the issue which you may find of value.
That's a good action, Bill thanks for posting it. For anyone who hasn't used the Adobe Studio Exchange before it requires a free registration to enter and is one of the premiere sites for free actions, brushes, styles, shapes and other preset elements for Photoshop, Illustrator and more. [righton]
Great sugggestios and resources Guys! You've got me hunting all over the net!
Hi DNA Eye Candy plug-in has a nice one called weave. It can go from very large to linen like. I always think of linen when the specification calls for cloth.
Digital Studio Backdrop Images !! 
Linear Mode
