Desktop Notepad – Draw on your Wallpaper!
Within the actionwheel, which is accessible with a triple left click, you can change your drawing color, lock the screen and clear your drawing!
The savestate is always kept in storage, even over system restarts, and can be overwritten and loaded at any time using the actionwheel.
The existing drawing can be locked and unlocked to prevent accidental change, for example when icons are dragged around.
With multiple screens, there are very likely a lot of issues in a lot of configurations, so I would suggest to only use the wallpaper on a single screen.
In case your cursor is offset, try going through the mouse calibration procedure from the wallpaper settings. Just choose "Mouse" from the "Calibrate this:" dropdown to start.
If you just saved a drawing and loading it cleared the screen, but did not paste the stored state, first try to draw anything, then paste again; if it still doesn’t work, switch to another wallpaper, then back to this and load again, it should work properly.