For a more finished look, attach cabinet knobs to the top of each conduit section. You can also add a bike chain under the address.
For the flower, punch a hole in the bottom center of a can. Use metal snips to cut slits about 3/8 in. wide, ending about 1 in. from the bottom, all around the can. Curve slits outward like flower petals. Drill a hole in the top center of a colored plastic cap (like that on a spray-paint can). Use recycled materials like colored wires and washers to decorate the top. Curl the end of the wires through the cap hole. Use a length of wire to attach the decorated plastic cap to the can bottom with cut petals. Then secure it to the sign.