Here's one against that idea . stone does not wash or antique like brick. It looks high end now and it will look bad after. This is the one thing that is real character that adds to your room . . when you look at the pottery barn catalog, look closely . . part of the reason you are drawn to the rooms is the terrific and interesting architecture - beams, stone, great doors and windows. Here, you have that . . you just need to know how to compliment it -

You are overreacting to an empty space and what the stone wall needs most is lighting (see the difference in the photo where the flash lit it up and the second picture?) Let's get some wash lights on it - you can do that with an electrician and can lights, or you can buy some battery powered art lights and mount them on the (they come in orb) ceiling at five intervals to wash down the face of the stone.This is a high end feature - the gold tones echo your cabinets next door and the wood tone, the wall color works okay but there are wall colors that would do even more for this room and stone if you were prepared for a neutral in a warm soft tone. . .

Now, take a little touch of gray into your decor . . lets say it is mostly neutral butter tones with blue green . . .use nickel toned lamps, drapery hardware, add some mercury glass elements, use one pillow fabric with butter and gray . .. voila! your room looks like a million bucks!