We have a unique usecase for one of our customers who would like to display a string property dependent on it's value in different font-colors. This would require us to do something like this:

«car.color:if(val == 'green')»
  «=car.color» but marked in green
«car.color:elsif(val == 'red')»
  «=car.color» but marked in red
«car.color:endIf»

Of course it would be possible to create a getter method in rails that checks each color but since this is a really unique use case it wouldn't make any sense to hardcode this into our software logic.