Post lamps come in lots of varying colors, which you can use to match the exterior accessories of your home for your own unique aesthetic.
The overwhelming majority of lampposts are finished with a weather-resistant iron or metallic coating. This means that they're going to be - in most cases - brown, black, or gray. However, you might be interested in knowing that that doesn't have to be the case!
If you're going for a natural, classic look on the exterior of your home, getting a true neutral such as brown or black is likely a good idea. However, if you like modern pops of color, deciding to purchase a lamp with a bright blue or red finish will ensure that you'll have a focal point in your yard!
One color choice that you should likely avoid is anything light in color - white, beige, yellow, or cream. As chic as an all-white post lamp might seem, they're likely to get discolored and dingy-looking because of natural elements. It's in your best interest to choose either a dark or bright color for lasting good looks.