In colorplan, projects 'age' while waiting for your attention. Every project can have its own aging priority and will get older based on that. This 'age' is reflected on the interface as the projects' background color: A 'green' project has been worked on just a few minutes ago, while a 'red' project requires immediate attention. After finishing a task related to a project, you mark the project as worked and - ding! - it gets a shiny green background again!
