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With last beta: https://dl.dropboxusercontent.com/u/13064071/plantuml.jar
You can have:
@startuml skinparam SwimlaneTitleFontColor red skinparam SwimlaneTitleFontSize 8 skinparam SwimlaneBorderColor blue skinparam SwimlaneBorderThickness 5 |lane1| :foo; |lane2| :bar; @enduml