trading up, a freecycle building

I'm a member of freecycle, the Yahoo hosted exchange and recycling system, where people get rid of their old junk (another man's gold), by posting an "offered" message on a big group email that is sent to all the users.  Offered, coffee pot, SW2... that sort of thing.

Similarly, you can request things... Wanted, coffee pot, SW2... you get the idea.  When you see something you want, or something someone needs, which you want to get rid of, you just email them and its done.  Its put me in mind of that guy in Seattle who traded a red paper clip up to a house... his version of the "bigger, better" game.

Would it be interesting to see if we could do something similar in architecture?  Could we build an entire house, and equip it from stuff that is other people's junk?  Extraneous hoovers, bits of drainpipe... I'm not talking about a house made of rubbish, but a properly constructed one.  The items offered are often high quality and perfectly working - with the consumerist culture of "upgrading", anything 2nd hand is almost always deemed to be worthless now, apart from houses, where age is seen as a benefit, which is almost unique.  A new house, that is already 2nd hand... hmmmm... think that could go down an interesting path...