Looks like saltpetre which is leaching through the brick. You may hae waterproofed the outside but what about water leaching from the roof. Water will find a way.... Here is an interesting link... http://www.arcane-industries.co.uk/l1/p281-dampness-saltpetre-condensation.html

I think this was just brick added to a wall so you should not need anything other than mortar but IMO this looks odd just put in the middle of a wall I would remove it

Thanks all, for the suggestion. Yes will stick to white for all other sides of the room. one is full glass with curtains, the other is behind the sofa, a plain wall as of now with no art or anything, this is just opposite to the brick wall. The 4th side is the foyer and a small wall with a artsy clock. The living area is more an open plan, that leads to dining on one side. I am looking for wall art ideas too. I create my own art for the home, I have not gone commercial, just do some art for friends too when they ask as gifts :-). We are changing all the furniture in this room, including the softa. have ordered recliners in light brown color, A square center table with stools underneath, and a side small curio/book shelf. Thanks once again.

ok pls provide me more details