You're right...it's worked!!!!
Sorry..it's my own fault..i thought i need to install it after copy.
I uninstall it using titanium backup,restart,re-copy LiveWallpapersPicker.apk, set permission,restart...and......it works!!^^
( a bit slow ,though...but that's to be expected)
btw, here's the link for LiveWallpapersPicker.apk, in case someone need it:
http://www.4shared.com/file/vqM5YsOI...r_21__App.html
(no need to bother with lib.7z inside the folder, we don't need it)