I absolutely love Himalayan Salt Lamps. I bought one when I was searching out the effects of negative ions on health and well-being.
The soft glow of the lamps add a gentle ambience to my home while doing their ionizing thing, and they run on a small 15-watt nightlight bulb, so I leave them on most of the time. After setting up my first large lamp, in our tv/computer room, I was hooked, so I sent for several smaller ones for the bedrooms. They deodorize the air, and seem to uplift peoples' spirits.
There are many negative ion generators available on the market, but the salt lamps seemed so natural and lovely, that I thought I'd start with one of them.
They also seem to help with allergies. (Maybe just a placebo effect... who knows?) But we all really enjoy our lamps anyway!