In my math center, one of the activities you'll find those same little miniature ornaments with numbers on them. I store them in a stocking and students take turns pulling an ornament from the stocking. They compare the number with the other students and the students with the bigger (or smaller - we use a spinner to determine who) gets to keep the other students' ornaments. The student with the most (or least) number of ornaments is the winner. I can easily differentiate this center by controlling the number range that each group of students work with depending on their readiness.
And, of course, my favorite center is always the sensory or sand table. I like to find interesting things to put in it for my kinders. Last month is was corn and although I usually put different types of evergreens in it this time of year, there are a few allergies in my class so for the moment I have some shredded green and red paper in it. I'm not crazy about it so I think I'm gonna actually pull it out. The one thing that WILL be in the sensory table no matter what else I decide to put in it is this gingerbread CVC letter sorting activity.
Finally, did you guys see the new Holiday E-Book Full of Freebies!!! You have to download this. I have three freebies of my own in it. It is amazing. Make sure you take a look.