I think it would be great to have the option of presenting Gallery2 images in a virtual (walkthrough) 3D gallery. Apart from the fun aspect, the ability to arrange and view images in an architectural space could be really useful from an interior design / curatorial / art consultancy point of view. Perhaps this could be done though an integration with Second Life?
http://secondlife.com/
It would be great to be able to show gallery2 images in a Second Life gallery - or something similar