Blueish

Blueish is an impressive hack of the Olive theme that runs on the GNOME desktop environment. Installing the Blueish theme is straightforward, and you can do it in a few simple steps. All you need to do is right-click on your desktop, select Change Desktop Background, and click on the first tab i.e., Theme. After that, you can drag and drop the theme's archive in the Appearance Preferences window. If everything goes well, you will receive a confirmation message, and you can activate the theme just by clicking on it.

For those not familiar with it, GNOME is an international project aimed at building a complete desktop environment using entirely free software. It includes software development frameworks, selecting application software for the desktop, and working on the programs which manage application launching, file handling, and window and task management. GNOME is part of the GNU project and is compatible with various Unix-like operating systems, most notably Linux, and is even included in the Java Desktop System in Solaris.

One of the key features of the GNOME project is its emphasis on simplicity, usability, and making things "just work." This is evident in Blueish, which provides a modern, sleek interface that's easy to navigate. With Blueish, you'll get a new look and feel that makes your desktop visually appealing, yet easy on the eyes. In summary, if you're looking for an elegant and user-friendly theme that'll breathe new life into your GNOME desktop, Blueish is an excellent choice.