I know, I know, when is he going to get to the address sign. Well here we go. We bought a second place a couple of doors down as a rental unit. It did not have an address sign, so here is what I did.
I took the cut out of the cactus and painted it green. I then went to Mexico, which is about 10 minutes away and bought some ceramic number tiles. you could also get them from most big box hardware stores. I laid the ceramic tiles on the cactus and traced around them. I then cut that out of the centre of the cactus. On the back side of the cactus I screwed on a 1/4" piece of plywood as a backing for the ceramic ties. I then glued the tiles into the hole I had cut and put clear calking around the tiles.
In the bottom of the cactus I drilled two holes and friction fit two pieces of round steel about 8" long. I then bought a cheap plastic plant pot and put the cactus into the pot, filled it about 3/4 full of sand to hold the cactus and covered the rest with rocks. It turned out way better than I thought it would and have had a ton compliments on it.
You can use your imagination and use a theme that fits the area you live in. Hope you like the idea.