Nice work, I think you should decorate the walls with smooth stones , slabs and desert blocks(A greek style design).
I was indeed thinking of making decorations involving different kinds of slabs. But I'll see soon.
What I did yesterday:
I actually finished my pre-made design. The rough structure is there now.
In the next pictures are the paint maps I made:
I'm currently trying to make some kind of redstone door mechanism, but it is really challenging! Confined spaces and complexity and stuff. I'll see if I can work something out, else I'll just put normal doors or archways in there *shrug*
Also: I still need to make towers on the top circles. The bottoms of the top and mid circles need working and i was thinking of making some sort of bottom on the walkways too. Staircases will be built to get from platform to platform. Looking to see if I can make some kind of waterfall down the edges. Wall Decorations. The ground floor.
If you have ideas or suggestions: feel free to post them. Constructive criticism is always welcome!