I'd do something like what you said.. facades etc.. but make it personal.. think about yourself and if you ever act differently around different people/hide certain feelings etc..
I did AS art last year, and my teacher was always saying to make your work personal..you get much better marks...and also the project will be a lot more interesting! With a project like this you might not want to 'reveal' your true self through your artwork or whatever, but that in turn becomes another issue to look at..
We did a project last year on identity, and I felt really strongly about my identity being perceived by others as just a physical thing.. and the pressures I feel as a female to conform to the 'skinny stereotype'.. so my final piece involved a series of quite revealing photos of my body.. and when I handed it in.. I did feel slightly embarassed yeah.. but I learnt most from that project and got my best mark!
So basically I just suggest make whatever you decide to do, personal to yourself.. you could use the idea of surfaces.. and think of your skin as a surface.. do some observational drawings and stuff.. ahh I'm rambling.. but you get the idea!