Recycled door would make a great trellis. This has barbed wire spirals connected together to form a panel. Thinking barbed wire would not be so good as a trellis, as the yearly clean out of dead vines would be a bear!
Barn House Vaulted Ceilings Living Room: a beach barn house on Martha’s Vineyard by Hutker Architects and Liz Stiving-Nichols of Martha’s Vineyard Interior Design. Love the open floor plan, that ceiling, and wall of windows.