Bring a ball to class... Throw it to a student and say e.g. "present perfect" or "a sentence with 'cook'", stuff like that.
Irregular verbs: make all your students stand up, ask any verb from the list of irregular verb. The student giving the correct forms may sit down.
For younger students, bring a song to class (one that has repetitions and is funny... there are songs about fruits, the weather, body parts, etc.) and teach it to them. Also, teach them a dance so they're not just sitting there stupidly. I've seen it done before and it's always a huge success.
Combining songs with a game could also be a good idea, like when the song stops, they have to sit down or something like that.
And there is this game that has the student in a circle... the students count to thirty-one and if the number coincides with the birthday of a student who has to count, he has to sing a song, tell a story or something.
If you were thinking among quieter lines, sorry