Common use cases for microinteractions in a GUI include:

1. Button interactions: Animations, effects, or feedback when clicking or hovering over buttons.

2. Form validation: Real-time feedback when entering or submitting form data.

3. Navigation: Transitions, animations, or effects when switching between pages, tabs, or menus.

4. Loading and progress: Indicators showing the progress of loading data, uploading files, or completing tasks.

5. Error handling: Animations, effects, or messages when errors occur, guiding users to correct actions.

6. Tooltips and hints: Contextual information or guidance when hovering over or interacting with elements.

7. Scroll effects: Animations or effects when scrolling through content, such as parallax scrolling.

8. Hover and focus states: Visual feedback when hovering over or focusing on elements, like buttons or form fields.

9. Toggle and switch interactions: Animations or effects when toggling or switching between states, like on/off switches.

10. Drag-and-drop interactions: Feedback and animations when dragging and dropping elements.

11. Confirmation messages: Feedback after completing actions, like "Saved successfully" or "Sent".

12. Micro-animations: Small animations that enhance the user experience, like spinning loaders or bouncing icons.

These use cases help create an engaging, intuitive, and responsive GUI that provides a seamless user experience.