I've been thinking about this one, too. Since I pretty much failed my SGP, I figured I need to get a head start on the PIP if I want to do well.
The one idea that I've had is exploring the cultural differences found in Westernized countries. Such as comparing Australia with Canada and possibly the US.
After living in Canada for the first 16 years of my life, and spending a lot of time in the US over those years, and then moving to Australia, I could base a lot of my stuff on personal experience...I'm just concerned that I won't find enough other sources out there to help me with it...
I haven't had many other ideas besides that one that aren't overdone...I had a cousin suggest I do something about the key role Music plays in shaping today's society, but I'm pretty sure that one is pretty generic.
Thoughts?