I\'ve moved all image resources in a large multi-project solution to a new project specifically created for shared resources.
Adding a new reference to other project
You only need add a new class project with a RESX file where you include the resources (images, texts, etc). After in the other projects add a reference to this and use the Resource class name in order to access the resource needed, for example: Project.SharedImages.Upload_64x64 (the result is a Bitmap ready to use in this case)