Moulding: Going All Out?

You guys, I must be a glutton for punishment. Just as I'm reaching the home stretch for finishing the crown moulding on the parlor level, I start dreaming of trimming out the rest of the walls. Like, top to bottom moulding.

Looking at the room they shot the West Elm Branch floor lamp in, did not help. (which, PS I really want that lamp!)

I think it would be easier to DIY this type of trim that lays flat on the wall. Crown moulding is such a beast!

Have you attempted anything like this? Maybe I'll just try it in the dining room and stop there if it's too much work/money. I'm especially drawn to the way the moulding and walls are painted that only makes the moulding look chunkier.