There use to be an XML API for albums, know as the web gallery xml API, designed for use with custom JavaScript driven album scripts ... that users would place on their HP's. The API was fully open and could be used to access otherwise inaccessible albums.
http://www.imvu.com/catalog/web_gallery_xml.php?av=
The API was decommissioned a few years ago though ...
Before that, the GUI version of the gallery interface with completely open, but they patched that around 12 years ago.
I'm not aware of any current data bleeds on IMVU's gallery / album system ... other than the default outfit picture.