Here's our few of our favorites:
Put a bunch of small items (hairclip, crayon, penny, ect) on a tray and let all the kids look at it for a minute. Then take it in the other room and remove a few items, then take it back and see if the kids can remember what's missing.
My Grandmother's Trunk: All the kids sit in a circle, first one starts by saying My Grandmother's Trunk has <something that starts with an A> in it. Next kid repeats what the previous kid says and adds something starting with the next letter in the alphabet, and on and on. "My Grandmother's trunk has an acorn, a bell, a candle, and a doll it in." ect.
Telephone: (I used to LOVE this game!) Kids all sit in a circle, one whispers something to the next kid, that kid whispers what she heard to the next, and so on until the last kid repeats out loud what she heard. It never turns out the same way as it started!
Treasure Hunt: Give the kids riddles to figure out together for clues leading them to and fro, have goody bags be the hidden treasure!
Doggie Doggie Where's Your Bone? One kid gets to be the 'doggie' and leaves the room or hides her eyes or whatever. One of the other kids puts the 'bone' which can be any old item behind her back. When the bone is hidden, they all say 'Doggie Doggie Where's Your Bone? signaling time for the 'doggie' to turn around and try to guess who has it.