Configuring GNOME themes for both gconf and dconf?

For a number of years, I've been making myself metapackages that pull favorite packages and pre-configure the desktop environment to use my favorite global default settings. This currently means configuring the gconf keys for the GTK theme, icon theme and background image for GDM. Until now, I implemented this by calling gconftool-2 directly in postinst as user gdm but Lintian recently started warning me that the correct way to do this would be by calling gconf-schemas or update-gconf-defaults instead. I was thus wondering, would anyone have any sample code that accomplishes this? To further complicate things, GNOME 3 has transitioned from gconf to dconf, which suggests that a slightly different method needs to be used to perform the same. Would anyone have any sample code to implement this? Thanks in advance to anyone who can help me with this!