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WidgeficationX lets you tinker with the transparency of your banners and widgets
WidgeficationX is a new free jailbreak tweak by Justin Petkovic that lets you customize the look of your widgets and notification banners by modifying their transparency values.
The tweak has a system-wide effect on your device, so you'll see the changes throughout your many iPhone or iPad interfaces, whether you're on the Lock screen, Home screen, or viewing Notification Center
Above, you can see just a few of the different ways it can be used to customize your widgets. For reference, the screenshot below shows you what they look like on a stock device: