3D Shape Dominoes! This is a great idea for students that are working on their shapes and names. It can easily be modified for a specific grade level, and is an amazing center activity kids would enjoy!!!
Geometry - Great way to find out what they know. Have a slip of paper with their name on it and a place for them to guess. Put these bags around the room and they have to guess. Then you can see what they know and still give them points if you so choose. :)