Nothing says mid-century than that silver bullet travel trailer, the Airstream. MWT and I have a dream to procure a smaller '60's or '70's model and give it the once-over, kind of like what Deb did. But if you don't have the temerity to jump into a house-on-wheels makeover, you can buy a new Airstream International, which architect Chirstopher Deam has infused with contemporary styling that harkens back to the mid-century (see below). You can read all about Deam's relationship with Airstream at this old but excellent--if I do say so myself--post. Of course, if your mid-century dreams are of the more stationary sort, may I suggest downloading Curbly's MCM how-to manual, Make It! Mid-Century Modern?