Install chameleon-cursor-theme by entering the following commands in the terminal:
sudo apt update sudo apt install chameleon-cursor-theme
modern but not gaudy X11 mouse theme
Package comes with 21 different mouse themes for X11. 7 colors (anthracite, skyblue, darkskyblue, white, pearl, mint, purple) 3 different sizes (small, regular and large) . Preview: http://www.kde-look.org/content/show.php?content=38459 . Warning: these pointers make some cats scratch the screen. In such case, you'd be safer with a theme without a pseudo-3D look.