As we have to have active compiz with Unity, I can't change the color, size, etc. of the cursor.
Is there any way for do it?
This is a known bug in compiz see https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/141500.
I found a workaround that works great for me on the bug page.
Open in gedit and paste the following
#!/bin/bash
mkdir -p $HOME/.icons/default
CURSOR_THEME=$(gconftool -g /desktop/gnome/peripherals/mouse/cursor_theme)
echo "[Icon Theme]
Inherits = $CURSOR_THEME" > $HOME/.icons/default/index.theme
echo "Compiz will be restarted to enable this. Please stand by."
compiz --replace &
Then Just run that file every time you change your mouse theme.
Edit /usr/share/icons/default/index.theme
to include the name of the new theme and restart compiz. You will also need to choose the icon theme in gnome-appearance-properties
for each user, in order to get certain programs like firefox and gdm to behave.
The way I got round this was to remove the default cursor theme.
Copy & paste this command into Terminal
sudo apt-get remove dmz-cursor-theme
Now the new cursor theme you want will be applied.