Obsidian Cursors is a shiny and clean cursor set created in Inkscape based upon my previous Polar Cursor Theme.
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/