Students give clues to each other to help determine the word (vocabulary, phrase, or even numbers) taped onto their back. Then, they have to find their partner. Creates interaction and forces a depth of knowledge about the word or topic.
Have matching words or number sentences written on index cards i.e. "tall" on one card, "taller" on another, "tallest" on the third card. Or, 3+5 on one card, 8, or 1+7, 10-2, etc. on another. Or, the word "giant" on one card, and "small" on the other (to show antonyms).