Here are some caps of Dean and Lisa's house with all the verticals and horizontals:
Here are some from the Campbell's hideout:
In addition to the stairs where Lisa and Dean talk, Bobby's house is full of sharp angles (and a lot of stuff). Claustrophobic doesn't even get close to covering it.
Dean is surrounded by all these crazy lines in places he goes regularly, the bar, work, the neighborhood.
Plaid seems to be what everyone is wearing this season: Sam and his blanket, Bobby and his wall of shirts by the front door, Ben, and the rocket sheets on Ben's bed.
Here's Ben in plaid, kind of dressing like Sam or Dean. Check out his boots.