Choose the column material you prefer. For example the column of the Soluxio can be aluminum, steel or wooden. Also, different colors and finishes are possible. For instance, anodizing and powder coating in various colors are all options.
Also, the solar modules are available in black and white. So if you would like to have the solar cells visible you may choose a white solar module. If you prefer the solar cells to become less visible, it is better to go for a black solar module.