I got an idea.
See this Clash of Clans level 6 laboratory?
You can add those purple glass portions of the lab to the base of the structure to add texture.
The result should look similar to a woman's hair brush but will look cool with the right materials and aura.
You can also add obsidian spikes to the base of the structure to avoid the base looking plain and make your base look truly epic. Hypixel Skyblock's End island is and example of what you can do at the base of the structure (and the island looks totally metal btw, props to the Hypixel Builder crew for that monstrous build - as usual).
You can also add ring to the long tube of your base's tower to differentiate the sizes of the tube and make the structure look beefier and sturdier with more detail to offer. Rings that don't touch the base of the tower tube will also look dope as well.
If you know how to and can do so, add cosmic bridges (done with an assortment of purple, white, back, magenta and pink stained glass) that gradually lead to each of the cells of your base. Reply to me if you need more clarifications.