Really Good Stuff and Debbie Diller have created a great work station (center) chart. I purchased it last year and loved it.
There is also a chart for grades 1-2 and 3-6. Really Good Stuff also offers work station signs and task cards to go with the chart. Debbie Diller's book Literacy Work Stations: Making Centers Work is a great book to reference when implementing stations (or centers) in your classroom.