Ok, with last beta http://beta.plantuml.net/plantuml.jar you can have
@startuml
!include <tupadr3/font-awesome/database>
title <$database>
rectangle "something\nclick the image:[[http://plantuml.com <$database*0.31>]]"
rectangle "something\nclick the image:[[http://plantuml.com <$database>]]"
rectangle "something\nclick the archimate image:[[http://plantuml.com <&cloud>]]"
@enduml
Does it sound good ?