Maybe couple of things, wacky, so I don't mean disrespect, but just some ideas to lighten up the space brick factor . . .
Add curtains, maroon or deep crimson with gold tassels. Haven't written me off yet? Let me explain, maybe you could add some sort of flowing fins to the design, far-reaching and organic (think dragon wings).
Also, add an arboretum, maybe some of those blue thrusters(?) in the back could instead be large windows to a Hanging-Gardens style area (you would have to add engines elsewhere, I suppose).
I could see this mammoth hanging on the edge of a black hole some where in deep space where an eccentric exiled emperor of a star empire resides, waits, and plots his return.
This ship is definitely big enough to have an open hanger bay, maybe between some of the pillars in the side.
Oh, and one more wacked-out idea. A statue or two, specifically a woman leaning out of the front holding up and out a wreath or something. Or two, one on each side, just aft of the pillar section (where the textures are some what boring), could make one evil, one good and could represent something about the beliefs of the builders (yin and the yang, or ping and the pong, etc.)