Sanctum Imperialis, the place of devotion to the God-Emperor. I have been using this building in games for years, though I only finished its paintjob recently. I have to say I love both the modularity and fine detail of this kit. Building it was simply fun even though I went for the basic look - which, while a bit boring, looks quite impressive. Only annoying thing was cutting the doors out of the large wall section, and gluing them in a proper position later. After few games, I actually removed the open doors completely, as they were just taking place that could be used by units.
I went with a red color scheme - the headcanon behind that is that the building is situated on a Newfound or some other planet controlled by the Genesis Chapter. To make the shrine even more pompous, the statues are painted in Shining Gold. The lamps are painted with Administratum Gray, washed with Nuln Oil and drybrushed with Vallejo White.
I didn't pay so much attention to the inner side of the ruin, so the paintjob is much more rushed there. I'm still thinking about the layout of ruined buildings for gaming - is it more useful and practical to have one-level buildings, two-level or even three-level ones? Is it more economical to split the kits into multiple, smaller ruin sections? Let me know what you think.