Just because one Lockscreen wallpaper is boring and I am too lazy to change it everyday.
» Jailbroken iPhone with SSH and WinterBoard installed.
» FTP application which can drop files into iPhone.
Unzip RandomLockBackground.zip and you will see LockBackground.html and private folder. SFTP to your iPhone, navigate to /private/var/stash/Themes.***/Current theme you are using, and drop files in there.
Respring your SpringBoard and you’re good to go.
The Lockscreen wallpaper will randomly change every time you unlock the phone.
* All wallpaper-images are the work of 天野喜孝 (Amano Yoshitaka).
* You can replace the images inside private/Wallpapers to suit your preference.
* You can edit LockBackground.html if you want to add more images into the array.
* To remove clock from Lockscreen, you need to install Lockscreen Clock Hide from Cydia.