This grass armchair featured on Treehugger is one of the coolest green ideas we've seen. It’s a self-assembled chair, including a 14-piece corrugated cardboard frame and a package of grass seeds. After finding the right spot (remember that you won't be able to move it later), filling the cardboard structure with soil, and a mere 10 days, you'll have yourself a grassy chair. We spotted it on Ready Made, whose editors call it "an idea they wish they'd thought of," a recurring sentiment that we can totally relate to. It seems that the biggest trick is finding a place for it.
If you have a yard or garden, you're in luck. For those of us that don't, we can hope for communal acceptance in our building's courtyard or backyard of our three flat. The grass armchair is available from Purves & Purves, a furniture design shop in the UK. With such little weight to this flatpack, don't let overseas shipping costs stop you.