This is an Xposed module that allows setting a different background than that on the homescreen.
The following modes are supported:
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Default (same as homescreen)
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Solid color
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Custom image
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"See through" - a blurred, frosted glass effect that "peeks though" the lockscreen
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Credits to David96 and AOSPA for see through mode, RoboBunny for Seekbar Preference, and GravityBox for everything else.