YUCK...that's one reason I never did nearly well in 'commercial' art classes I tried, as I did in fine arts; I could never stand for anyone to dicatate the ideas myu art should present!
And yes, that's a nice sentiment, but I agree, it sounds like a real time waster for a German class. I googled the theme phrase, and as your instructor has probably mentioned, it's something that an organization at LA City College came up with for Foreign Language week. Their poster has a picture of all-colored hands holding up a globe--how original. Maybe you could make a collage of 'people helping people" from differenr countries, or maybe something hokey like showing a South American banana farmer, an Alaskan fisherman, and an Asian spice harvester, arranged around or leading to a French chef

That's not exactly the warm and fuzzy it sounds like the teacher wants, but it's quick. I don't think "stealing' my 'example' in this case would matter, since I'm not doing it for you, and after all it's so very off subject. Told ya I'm bored!