This is an idea I got from somewhere...
I printed out several flags from different countries, then wrote how that country says "hello" in their language. I stuck them on sticks, to resemble actual flags. Then, when we have visitors, a visitor picks a flag, and we sing the Hello song in that language. Some become a mouthful because of the multiple syllables, but the kids still love the challenge.
Here are a few we've done:
Italy, "ciao" (chow)
Greece, "Yia Sou" (yah-soo)
Germany, "Guten Tag" (gooten-taag)
China, "Ni Hao" (knee-how)