I need case studies of non-profit companies or charities that have
undergone rebranding. I am a student working for a major charitable organization
in Canada who is interested in rebranding themselves, and developing a
strong brand image, and I am researching other non-profits (preferably
charities) that have done this type of thing in the past.

Obviously of interest, are how such actions led to increased donations
and awareness.

At best, I'm hoping to find case studies or detailed information on
specific companies already compiled.

I have come across some examples, such as the World Wildlife Fund,
Unicef, and Habitat for Humanity, but I can't find detailed
information on what actions have been taken, and what the results have
been.