This is the second iteration of my RainLock skin for Rainmeter. The update contains a GUI to change the passcode, the ability to edit individual buttons and a lockscreen clock. The default passcode is 5555 and the default buttons hover light green and click dark green. This can be changed by editing the individual images for each button.
EDIT: If you are stuck on the lock screen, you can get out of it by ctrl right clicking the lockscreen and unloading the screen. You can then open the skin folder and change the passcode in the RainLock.inc file.