A LAWN CHAIR!! This pic is originally from a kit, though I dont believe the kit is available anymore. But no kit required... just find an old ugly cool shaped chair that you can use as the foundational shape and then mold the soil around it, plant it with grass, ground cover, moss, etc.... and you have lawn furniture in the most literal sense!!!
Garden furniture that you grow yourself? You better believe it, because the Terra Grass Armchair is set to take the great outdoors by storm. Simply assemble the structure, fill with soil and sprinkle with seeds. Sit on that!