The Altoona Curve have a reversible "rally cap" design on the inside. It's interesting, especially since I dig a lot of Minor League designs.
http://altoona.curve.milb.com/news/article.jsp?ymd=20110405&content_id=17388270&vkey=pr_t452&fext=.jsp&sid=t452
http://altoona.curve.milb.com/news/article.jsp?ymd=20110405&content_id=17388270&vkey=pr_t452&fext=.jsp&sid=t452