Use the colorful literacy signs to define your center areas. You can also print them smaller and use them on your literacy center management chart.
There are 12 signs in all (writing center, reading center, ABC center, vocabulary center, puzzle center, listening center, handwriting center, nonfiction center, computer center, blocks center, housekeeping center, overhead center) plus two blank ones that you can personalize.
I printed these out, glued them on card stock, then had them laminated. They brighten my classroom and clearly define where each center is.