1. A computer-implemented method for facilitating user customization of the image content of an image container in an electronic product design, the method comprising displaying an electronic product design to a user, the design containing at least one or more user-customizable image containers, each image container characterized by an associated height-to-width ratio and each image container having associated therewith a base image and cropping information identifying at least a portion of the base image as content of the image container; allowing the user to select an image container in the electronic product design for customization of the content of the image container, characterized in that in response to a user request to perform custom cropping for the selected image container, the associated base image and a cropping indicator having a height-to-width ratio which matches the height-to-width ratio of the selected image container and positioned over the base image to indicate to the user the portion of the base image that is the current content of the image container is displayed to the user.