Change iPhone Folder Background?

Can anyone let me know how to change the background folder image on a Jailbroken iphone 5. I have read and watched many a tutorial but after following the instructions, the folder background either turns black or nothing at all changes.

Try this one: http://www.iphoneincanada.ca/news/how-to-create-your-own-folderswitcher-background/
Sorry if you have already read it.

Pay attention to the file type: perhaps you are not using the correct one, which would cause it to go black.

Settings.

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