Check it out! You can blur images dynamically using only Actionscript. This can be useful for pause screens or image gallery interfaces (to name just two of the uses). It's surprisingly easy to do. Tutorial follows. Download the source at the bottom.
First, load the images
Loading images is easy enough if you have an index.txt somewhere (or even easier if you're using Air).
There are several ways to load images, either silently or by querying the user for a location. In this example, I choose to load the images silently from an adjacent folder "assets/images". Inside this folder I've specified for a "index.txt" to always exist, containing a list of images (also in the folder) to access.
Once I've loaded the index.txt into an array, I go ahead and load a random image every time the user clicks a designated "load image" button on the stage.
Blurring the image
Once an image has been loaded, it has to be blurred. I do this when the user clicks a "blur image" button, but it can be done without user interaction as well. The code below actually toggles the blur effect, which is just a bitmap that generated and added to the stage or removed from it depending on the "blurred" boolean.
Feel free to mess around with the source.