There's also a section on making your own theme. I'm going to keep looking to be sure about the login manager.
Edit: I couldn't find anything that stated it explicitly, but I found these in the included package list on the pandora wiki.
slim - 1.3.1-r4.5
slim-op-themes - 1.0-r3.5
I can only assume it's up to date. I don't have mine, so I can't verify. I think the default themes were listed in the config file on my distribution, but I honestly can't remember. I hope this helps.