Wow, that is so cool, Pash! I hope you'll share lots of pix, and maybe even blog about is using your peacetiles.net account (a community blog comes with it :)

In terms of how you organize it, start with one each, and encourage trade among yourselves: try to make a game out of it ie the whole 'secret santa' thing or something. if it goes really well, maybe have enough materials so everyone can do two. maybe you can, at a minimum, create a "family tile" to send a collective message into the world?

Irena in Macedonia just uploaded a new tile available for swap ... there are others you can browse online. I could get your tile(s) to South Africa, Costa Rica ...

Can't wait to hear what you decide!