Dwell Magazine and Inhabitat have posted the top 20 finalists of their Reburbia competition, which challenged designers to develop new visions for the future of the American suburb. The entries range from extreme, eco-conscious interventions to sharply observational proposals. For example, Chiu envisions a drastically altered future for suburbia in Frog's Dream (pictured above), where McMansions have all been abandoned and are repurposed as biofilter water treatment plants, taking advantage of existing transportation systems to surround the city with a rich suburban wetland. We're not sure why the McMansions remain standing (aren't there toxins in there?), but it does make for a provocative visual!

On the other side of the spectrum is the Urban Sprawl Repair Kit (pictured above), a set of drawings that proposes small changes to common suburban building types, combatting sprawl. We love that Galina Tahchieva, the designer, visualized her new-urbanist ideas in true suburban style: developer-inspired, mock-watercolor renderings.

More images of these and a few more of our favorites follow after the jump, including a parasitic highway turbine and parking lot farms.

Parasite Catalyst: Freeway Wind Turbines by Joseph De Le Ree

Urban Sprawl Repair Kit: Repairing The Urban Fabric by Galina Tachieva

T-Tree: A Towering Community of Sustainable Residences by Adil Azhiyev and Ivan Kudryavtsev

Bumper Crop: Converting Parking Lots to Farms, by The Miller|Hull Partnership