Obsidian Cursors is a shiny and clean cursor set created in Inkscape.
In computing, the X Window System (commonly X11 or X) is a windowing system which implements the X display protocol and provides windowing on bitmap displays. It provides the standard toolkit and protocol with which to build graphical user interfaces (GUIs) on most Unix-like operating systems and OpenVMS, and has been ported to many other contemporary general purpose operating systems.
X provides the basic framework, or primitives, for building GUI environments: drawing and moving windows on the screen and interacting with a mouse and/or keyboard. X does not mandate the user interface - individual client programs handle this. As such, the visual styling of X-based environments varies greatly; different programs may present radically different interfaces. X is not an integral part of the operating system; instead, it is built as an additional application layer on top of the operating system kernel.
Unlike previous display protocols, X was specifically designed to be used over network connections rather than on an integral or attached display device. X features network transparency: the machine where an application program (the client application) runs can differ from the user's local machine (the display server).
X originated at MIT in 1984. The current protocol version, X11, appeared in September 1987. The X.Org Foundation leads the X project, with the current reference implementation, X.org Server, available as free software under the MIT License and similar permissive licences.
Either install through whatever means your desktop's theme settings has or simply extract the archive to ~/.icons/
In GNOME, to select the theme, click the customize button in the Appearance prefferences application. Then go to the pointer tab and select the theme.
KDE users please note that installing the theme through the control center can cause some cursors to use the default X cursors. To fix this simply extract the theme directly to ~/.icons/