Visual Indicator for when Input is Suspended

When connecting to an session with "Suspend My Input" enabled by default or when switching between sessions, you may not realize that input is being ignored. When interacting with the window for a session where input is currently suspended, could this be indicated?

Examples: Could a notice be shown on the top of the screen, or the screen be given a "ghosted" appearance, or the mouse pointer be changed to indicate input is blocked (a Red X, a Circle with a Strikethrough, etc.)? Perhaps a mouse click could generate a "thud" or splat sound, or an animation of a tomato hitting a wall?