These pre-k center signs can be used within your centers.
What I have done is allowed my students to freely choose their centers. Each of my students have a popsicle with their name on it and a piece of velcro on the back of it. When my students have decided where they want to go, they place their stick on the sign. Each sign has a number of students that can be there according to the color boxes. I usually place another velcro piece on the color box so it's easier to stick on. If a center has three boxes, only three students are allowed at that center and other students must choose a different activity.