Thanks to the guys over at Icons8 License, I could freely use their icon sets and I created a Windows 8 theme for the FileZilla FTP client! The default icons of FileZilla are dated, to say the least, so they could use an update.

32×32 pixels FileZilla theme

16×16 pixels FileZilla theme
Download the icon set below:
To install this theme, you should unpack the .rar file and, depending on your operating system, place it in the right folder.
- Windows (XP, Vista, 7, 8, 8.1, 10): C:\Program Files (x86)\FileZilla FTP Client\resources
- Linux (e.g. Ubuntu, Linux Mint, CentOS, …): /usr/share/filezilla/resources/
Then, open up Filezilla and select the newly installed theme.
Edit → Settings → Interface → Themes → Windows 8
You have the option to choose a 16 pixels by 16 pixels, or 32 pixels by 32 pixels. Enjoy! :)
A BIG thank you, finally a beautiful interface for my favorite FTP client!