Take a piece of paper and draw a circle. Ask the students what they think the circle is. After they guess, tell them that it represents your world. Draw three symbols inside of the circle that hold significance for you -- perhaps a pizza, a blue shirt and 1983. Have them guess at what the symbols mean. When they're finished guessing, tell them what the symbols mean. You could say that your favorite food is pizza, your favorite color is blue, and you were born in 1983. Have the students draw their own circles with three symbols inside of them, and let them guess at what the other students' "worlds" contain. Then they can take turns explaining their worlds to the class.
Have everyone sit in a circle and give them each ten coins, clothes pins or other small objects. If they can't sit in a circle, just give them each a bag to put their objects in. One person in the circle says something they've done, such as "I've gone sailing." Everyone who has gone sailing throws an item into the middle of the circle (or puts it in their bag). Each person in the circle takes a turn saying something he has done. The game is over when someone has thrown all of his items into the middle (or put them all in the bag).
For this charades-style game, call a student to the front of the class -- preferably an outgoing one at first -- and give him an adjective to act out, such as wet, happy, friendly, athletic, etc. Use simple adjectives to start out with and make them more difficult as the game goes on.
This is a classic game. Take sticky notes and ask the students to write the names of famous people on them. Collect the sticky notes, shuffle them and have each student place a sticky note on his forehead or back. The students walk around the room and ask other students yes-or-no questions about who they might be. The game is over when all the students have guessed their famous character.