The Differentiated Centers - Smiley Faces will allow you to differentiate your centers in a very easy way. Your students are most likely not on the same level and need some type of differentiation at their centers. Well, I color the smiley faces colors that match my center groups. For example, I have a green group, so I would then color one of the smiley faces green and so forth. When students visit the center, they refer to the smiley faces to see exactly what they need to do at the center. This idea has organized my centers tremendously.