Finished the stone pillars today. I painted in the edge lines with almost-black paint to make them stand out better and cover the pink that had bled through from the pen. Then I re-highlighted everything with a light drybrush. Last was cutting out slots in the bottom for the 3/8" nuts I used to weight them and hot-gluing the nuts in.
I don't love them, but they'll do the job, and I learned some things in the process. Good enough!