Today I was looking around on the web for some icons to use in the ModelConverterX tool. Of course there are a lot of places where you can buy very expensive icons to use in your application, but that was not really what I was looking for. In the end I came across the Tango Desktop Project, a project with the aim to help create a consistent graphical user interface experience for free and Open Source software. They have a nice set of icons and I think you will see some of them appear in my tools in the future.