I think the default LinuxMint login screen is not cool, need a new backgroud picture. How to change this backgroud picture? In LinuxMint 17 this is done by creating a new login "Theme" and use it. According to Custom Login Screen Background On Linux Mint 17 there is 3 steps to achieve this:
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Create a new theme based on the default theme;
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Pack this theme;
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Set it as the login theme.
Firstly I choose a picture from Variety's Favorites folder as the new backgroud. Then run following commands:
sudo cp -r /usr/share/mdm/html-themes/Mint-X ~/StarWorld
cp ~/.config/variety/Favorites/fbdgbcb_-_imgur.jpg ~/StartWorld/bg.jpg
cp ~/.config/variety/Favorites/fbdgbcb_-_imgur.jpg ~/StartWorld/screenshot.jpg
# modify name & description in ~/StarWorld/theme.info
tar czf star-world.tar.gz ~/StarWorld
Next login to Xfce desktop, startup "Login Manager", add a new theme, choose star-world.tar.gz.
Now logout and see the effect.