This is a free drill and is best used after you have done choral drilling.
How to play: Make photocopies of your flashcards. Scrunch up the copied flashcards into a ball, ask the question and then throw the ball to a student, who then has to respond to the question based on the flashcard. The student who answered the question now takes the teachers role, asks the question and throws the "ball".
To get more student involvement, have multiple flashcards going at the same time!