Aww. I took my chances and hung a bunch of lighter pictures in my living room. I used those anchors for plaster, and I put masking tape on the wall when I hung them to keep it from cracking. I wish I had high enough ceilings to have picture molding.

But my spare bedroom does have a mural painted on the wall instead

Upstairs they drywalled OVER the plaster, so between the drywall, plaster, and lathe, I have about an inch of material to hold lighter frames...but the walls are mostly window (and knee walls), so it doesn't really matter.