A useful starting point can be to explore sounds and imitate of sounds in the target language. This will develop a confidence and flexibility in pronunciation.
They can sing songs or rhymes
http://www.laukart.de/multisite/index.php
including Silent Night
http://www.silentnight.web.za/
Youtube can provide foreign versions of famous songs, such as I can sing a rainbow. Great for the colours:
In Spanish
https://www.youtube.com/watch?v=HkBo38sd9U4
In French
https://www.youtube.com/watch?v=WZWN2Uragvc
or another less well known rainbow song in French
https://www.youtube.com/watch?v=-4kNeFGBAcw
Have a go at tongue twisters in different languages
http://www.uebersetzung.at/twister/
Send a e card in a foreign language
http://www.123greetings.com/world_languages/