Wow. Those cards are amazing! Both sets are really great, and although they are totally different, you can kinda' see similar elements.
What a wonderful idea for project (or a personal swap). Person A sends a few things to person B, and vice versa, and you have to make cards out of whatever you end up with, and maybe then exchange them!!!!! [Katxena wanders off to to plot....]
In our case it was made a little bit easier by the fact that we're friends and live close by to each other but yeah, it could work really well just sending the same paper that you have to someone and doing it like that. We did each have a tiny bit of japanese paper that was diff't from the other person's....