Typographical wizards You Talking to Me create gorgeous signs. Their series "Vegetal Identity" is made with real—although not living—plants. Despite looking very much alive, the stabilized moss, ferns, and other vegetation do not need to be watered or exposed to the sun. The team replaces the plants' sap with preserving liquid to give it the illusion of lush, living botanicals. The embalmed plants are supposed to stay green for about ten years, and they are entirely biodegradable.
The company signs have been used in offices, storefronts, and at festivals. Some, like the Lacoste logo, come with an LED backlight that makes the whole fixture glow. Check out these verdant examples:
Images courtesy of You Talking to Me.
[h/t: Design Taxi]