As far as saving icons, and themes, nothing has changed as far as I can tell. Icons/PNG files are saved to the OdjectDock  directory (you can group them in folders as long as they are in the OD directory) Backgrounds go in the Backgrounds folder, Docklets go in the Docklets folder. For themes, double-click the theme, then open the configuration dialog, and click Load themes. Piece of cake! 