Here is a fun and simple way to introduce, or review, a handful of Flashcards. It's so simple that it doesn't even require any explanation.
Just show a card, turn it over and ask what it was. Then add another and see if they can remember that card too.
Just keep adding cards (about 8 or 9 seems to be the limit).
It works great because the students can work as a team without fear of making mistakes, and they get tons of speaking practice.