Hello Song
 

We sing the "Hello, Hello" song but pick 2 flags (get book from library or search online for different flags) with other languages written on them. One week we may sing "G'day, Bonjour" "G'day, Bonjour" etc.  Here is a great website that gives you 800 ways to say hello!
 

Christy's Clipart for the Hello Song - This site also includes flags to print out to go with the different languages.
 

We have a pencil can that we have full of flags from around the world, about 15. On one side is the flag and on the other we have the country, the language, and hello in that language. Whenever we have a visitor we pick 2 flags and one half says hello in one language and the other half in the other language. The kids love it. (Idea by Angella in Washington)