With the GTA V SkinPack you can make your Windows look like GTA 5. It works on Windows 7 and 8.
After downloading the compressed file, click to extract, a password will be required, paste the following password: skinpacks.com. Run the file you extracted, click on Next, agree to the terms and click on Next.
Pay attention to this part: Click on Cancel and then Decline, refuse all confirmations to install extra programs. In the final part, keep everything checked and click on Install.
It is advisable to create a restore point for Windows, as this software modifies the operating system, and if something goes wrong, you can simply return to the previous point.