If I've got a centre, I will have a small room with child-sized sofa (preferably L-shaped) and on the sofa I will have cushions and soft toys. The door will be those wooden door with big glass panel in the middle of it so that the room will be supervised. There will also be a window so that from the office, the room can be seen. On the wall there can be photographs of children or children's artwork.
The room is for all children who feel unhappy or angry to go into, or when they want to talk to teachers or the supervisor privately. (Meaning: They can choose to talk to the teachers or have their own private space.)
I will be a teacher who will try to remember every child's names and their preference for morning greetings. Perhaps some like hugs, some like to just say morning, etc. It may take time (because of my extremely bad memory) but it's worth the effort when by the end of the day, children will be close to you. But bear in mind, you need to be strict sometimes and set limits, so that you won't be manipulated by the 'little angels' you see. *grin*