How to change icons in Gnome 3
If you don't like the current files and folders in Gnome, you can use a different theme icon. If there is only one specific icon you want to change, it is very easy to change the icon in Gnome 3. You can change any file or folder icon into a custom icon, as long as you have their own icons in SVG or PNG format.
Note : Although this tutorial is for GNOME 3, the same trick can be done on other Linux file managers and desktop managers.
Start by activating your favorite file manager to find files or folders whose icons you don't like.

Right-click on the folder and select Properties . Although it's unclear, the image in the upper left is not only a preview of the active icon, but also the point where you can change the icon, since it acts like a button. Click the image, and a file requester will appear.

Point the file dialog to the image you want to use as an icon. It is worth noting that GNOME officially supports the XPM format, in addition to SVG and PNG files. However, Gnome still recommends that you avoid this format as it is only supported for backward compatibility reasons.

When you return to the main Properties window , the icon preview at the upper left of the property sheet will be updated, displaying the image you selected in the previous step.

Close the Properties dialog box and from now, your file or folder will display with a custom image as an icon.

It's simple to change icons in Gnome 3, right?
Hope you are succesful.
You should read it
- What's remarkable about the newly released GNOME 42?
- The latest features of GNOME 40
- How to Change Themes on Ubuntu with Gnome Tweak Tool
- How to disable automatic workspace in GNOME
- How to work with workspace in GNOME
- The 10 best features in GNOME 45
- How to use GNOME 45's new Activities indicator
- How to configure color temperature in GNOME Night Light
- How to benchmark storage devices with Gnome Disk Utility
- How to install GNOME on Ubuntu 20.04 LTS Focal Fossa
- How to integrate Google account into GNOME Shell
- Should I use Linux desktop KDE or GNOME?