It's a plant and rain would be falling right on it so yeah, it shouldn't hurt to get them wet. If you're gonna spray directly on them you can put a very little bit of a mild detergent in the water to act as a wetting agent so the water doesn't bead up and it helps to uniformly dampen the plants. I've heard that you could burn small spots on the leaves if you have it kinda close to a bright ass light by the water droplets acting like a magnifying glass...I dunno if that shit is true though I've never had that problem.

Also, your idea about the pots of water in the room will work to raise the humidity. Thats what I did in the past anyway, and it worked for me.