This compo might be difficult break ice with. A good theme goes a LOOOONG way because it defines nearly everything. Whether it be sci-fi or modern, try mapping something you know. Re-imagine Zeeba_Pool, Gauss_God, or DE_Dust_Thunder in a color scheme that is outside your usual or the predictable.
This is a fun tool I found.
https://kuler.adobe.com/create/color-wheel/Also if you want to create something non-themed and unique, you can try different
Archetecture (they forgot to list Rococo) or my personal favorite, base the archetecture on the designs seen in
furniture.