I would be interested in hearing about your experiences with image
collaging in UX. What's worked, and what hasn't?
Here are some collage-related techniques I have used over the years.
Traditional moodboards: Works well to inform visual design aspects of
screen-based interaction. Does not really support temporal aspects
Cutout animation (see webzone.k3.mah.se/k3jolo/Download/ausdr.pdf):
Works well to visualize use scenarios that are difficult to express in
video sketches. Downside is that they are more expensive than video
sketches to make.
Example catalog (pre-produced collection of distinctive examples
within the design genre at hand; see webzone.k3.mah.se/k3jolo/
visCat/): Works well if used properly to involve non-specialists in
early phases of design processes, helps other stakeholders understand
interaction design processes and concerns to a certain extent.
Downside for non-specialist use (particularly managers) is that the
catalog cards sometimes stimulate premature or unwarranted decisions
based on superficial visual preference.