This is where Masks files are stored.

The directory structure is :

Icons (for non-Retina iDevices)
Icons_iPad (for iPads)
Icons2x (for Retina iDevices)

Same goes for WallMasks respectively.

You can delete masks you don't like, from the directory matching your device, or you can add your own.

To add a custom icon mask, create an new, icon-sized white image, and add any black shape in it.(Yes, its so simple)

Then save it in your corresponding directory. (/var/mobile/Library/Masks/Default/Icons (icons folder depending on the device) in png format, and the name starting with "mask" and ending with the next number in your masks collection
 e.g. "mask46.png" (or mask46@2x.png for Retina devices)

Icon sizes: 
59x59 (non-Retina)
118x118 (Retina)
78x78 (iPad)

(same goes for both Default and Collections directory)


To add a custom WallMask, create an new, screen-sized white image, and add any black shape in it.
Then save it in your corresponding directory. (/var/mobile/Library/Masks/Default/WallMasks (WallMasks folder depending on the device)

WallMask sizes:
320x480 (non-Retina)
640x960 (Retina)
1024x1024 (iPad)


