This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
The default render is a subclass of JLabel, so you can use JLabel methods to alter its look, like it's alignment properties. One thing I've found handy for aligning is to use an empty icon to preserve alignments: