• when the project is saved as "myProject.xml", store in the same directory "myProject_Background.jpg", "myProject_Planned.jpg", "myProject_Started.jpg" and/or "myProject_Finished.jpg"
• re-open the project
• menu options
• turn images on and off

(the backgroundimage is tiled, the size of the other pictures should fit to the size of the WBS; see examples)