First, I primed it in black.
Second--and this step is actually still ongoing--I'm conceptualizing what I want this lump of plastic to become. I've decided that I want to transform the Droid Factory into a small tropical island, perhaps with some man-made structures left behind by a dead civilization. I see a sandy beach, some grass, perhaps a water feature comprised of a waterfall and pond. Some palm trees and tropical foliage to fill out the island, and perhaps the entrance to a cavern.
My next step will be to choose which of the Droid Factory's assorted peaks and valleys to shave down or fill in, and which to adapt into natural variations in the terrain. I'll use Green Stuff for that, my first effort with the celebrated modelling clay.
Once I've created the general shape of the island, I'll lay down soil, sand, grass, and other materials to disguise the plastic. I'll start shaping water features, maybe a little pit of quicksand, perhaps a bog, maybe an outcropping of rock, and perhaps some ancient ruins.
Then I'll move on to more ambitious tasks, like the cavern entrance and water features. Finally, the trees.
How's all this going to look? I guess we'll see.