geo ip resolution is the easiest part of it, i would store country only because I don't want to store users IPs.

"Hard" part that I'm referring to is creation of visualization, choosing the right images [e.g naked woman from renascence painting, naked man from modern magazine] and putting it all together.

I was thinking something more "visualcomplexity.com / flowingdata.com" scale, and less "hotornot" script.