Well I figured this out myself but it seems someone else has already done it. They failed to make a proper tutorial so I will give you all one. First off, download the Bink player Here. You will be using this program to make the actual screen savers. Next, find where you have installed L4D or L4D2 and explore to the 'media' folder. It should be Steam>steamapps>common>left for dead 2>leftfordead2>media. There you should find these files: Now open up Bink and explore to your L4D media folder: Select one of the backgrounds and click Advanced Play(seen in the above picture). It will bring you to an options box. Select 'Loop the playback'. Farther down in the options you have the 'Screen position and scaling' section. Enter your desired resolution in the width and height section(I suggest your actual resolution). At this point your options should look like this: Hit the 'Make EXE' button. Under the options presented to you, select the 'Create screen saver' option. Choose where ever you would like to output the file (I suggest Windows/System32 since that is where the screen savers so you can choose them in the screen savers options with Windows.) Now hit compile, then repeat, and enjoy! Edit: Any video that plays using Bink player can be made into a screen saver. Have fun!