If you are looking for new Icons to install visit the AppCenter. Once installed follow the instructions below to switch between installed Icon Themes.

To switch between Icon Themes, launch the Application Theme Settings tool. This can be achieved using a number of methods:

• Quick Launcher: Open the Quick Luanch (WinKey + <space>) and type Application Theme and press <enter>
• Main Menu: go to Menu > Settings > Settings Panel. With the Settings Panel open, if the window is not maximized maximize it now, click Look from the toolbar and select Application Theme from the list of options

Click on the Icon tab at the top of this window, then select the icon theme you wish to use from the list and then press the “Apply” button.