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Currently we use flash() for getting the users attention with a message in the page. We use it for both failures and success, however it's always the same colour. It's logical that people should have an idea of failure or success based on the colour.
The migration to Flask and Bootstrap in Beaker 0.15 is designed to allow this to be improved over time. There may be an explicit note to be made in http://beaker-project.org/dev/guide/ui-guidelines.html, but that's not really a *bug* in Beaker itself.