Found a number of "Model" selection dialogs using the WidgetUtil.showWorkspaceObjectSelectionDialog() method that defaults to the WorksbenchLabelProvider class.
Result is that typed metamodel icons are not used and all models show "green" default icon.
Just need to use another WidgetUtil.showWorkspaceObjectSelectionDialog() that takes a label provider, namely ModelExplorerLabelProvider
Checked fix into 7.4 and trunk