Techniques for overlaying objects of a software application with other objects allow modification and customization of the application by one or more users in different ways, without storing multiple modified copies of the application. The technique allows configuring the software application to execute using overlaid objects instead of the base objects contained in the software application. In some embodiments, the base objects for the software application and the overlaid objects are stored in a datastore, and a runtime embodiment causes execution of the overlaid objects instead of the base objects.