Pretty much all the easy stuff is now done. I have built the base, basecoated it, washed some parts, and drybrushed everything.
I am going for a dirty grey colour, a scheme that was once labeled 'urban' or 'hive world' or something like that by GW - until they decided to remove all pages that mentioned their 'old' colour range. First I went with a very dark grey - a mix of Chaos Black and a little Codex Grey. I then washed the ground with black wash. Everything has then been drybrushed with Codex Grey, then Fortress Grey, then, for the stone parts only, an extreme highlight of Skull White. Its a challenge to make the different textures stand out from each other while using the same colours. But that's one of the nice things about drybrushing - by varying the intensity or even just the direction with which you do it, you can create different effects that look quite convincing, quite quickly.
At the moment then, the base looks nice, but monochromatic. The next step is to bring out some of the details, particularly the gold on the collapsed balustrades and fallen Imperial icon, and get a bit of colour in there.
Its also important to remember that a lot of the base will end up covered by the figures I am going to display on it though, but hopefully there will still be enough of it visible to add character and a sense of belonging to my miniatures.