A set of cards with vocabulary concerning hobbies and interests (including verbs like, love, enjoy, prefer). You can use them in different ways:
1) As a simple exercise: students make sentences containing the word on the card they got;
2) Students interview each other using the clues on the cards;
3) Students use the cards to learn / revise vocabulary on the topic.
Cards are more fun because there is the surprise element. Plain but efficient.