At the Alameda Marketplace, I have found a client who shares my dream that even signmaking can have a Cradle-to-Cradle life cycle.
This sandwich board sign is roughly 65% salvage by weight. The wood support and hinges are from an old toddler gate and the "rope" is a 20 year-old computer cable (7-pin, round serial).
The sign face is a new piece of aluminum and plastic. I don't know how you'd separate this kind of sheet product for recycling, but the plastic feels like HDPE and of course aluminum is recyclable.
I've been calling and emailing the folks who make the corn and rice starch packing peanuts. I want them to make a starch-foam infill fomeboard. All fomecore board, right now, uses a polyurethane or similar foam inside, so it has to go into the landfill.
Oh, hey, wait... maybe tired foamcore signs could get shredded for packing material?