As mentioned here:
http://forum.cakewalk.com/FindPost/3415439 Add an image and/or icon in the Project Info file along the other project metadata.
This image could be used as a thumbnail in a project folder, in templates on the start screen, etc.
The method in the post is a hack that works for now. But hacks are often hard to remember and when they become the 'standard' tend to make newcomers annoyed and frequent helpful posters work harder.