One of DeviantArt users, Hamedsp, has created a nice pack of Windows 10 icons that you can use to replace the default icons in Windows 7, 8, and 8.1.
How to use the Windows 10 icons:
- Download the icon pack installer (6 MB) from this DeviantArt page
- Extract the ZIP file
- Rename setup.ex_ to setup.exe
- Double-click the setup.exe to run the installer
- Tick off the box of “I accept the terms of the License Agreement” and click Next
- Press the Install button
The installer will create the restore point and then replace your icons. If you don’t see any change, try to refresh your Windows icon cache.