[Q] Change default wallpaper

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I use a program (pwall) to rotate my wallpapers every hour and for whatever reason, my lock screen uses the default wallpaper of CM6 nightly, which is some green grass. However the actual wallpaper changes like it should.

I saw a guide somewhere on how to change androids default wallpaper but after an hour of searching, I couldn't find it.

Please help me figure this out,

Thanks!