You do not mention whether you wooden wall will be painted or stained wood. Either way, there paint products you can use to properly seal and protect the wood either way. You should visit your local paint store and tell them what you are trying to do and see what products they recommend.

OSB board will do the trick. You need another photo for us to offer a species and finish. Natural finish (clear coat...water based polyurethane finish...NO oil modified) in a low gloss or satin finish on white oak with FLOOD LIGHTS will offer the same "look" as the poor photo. Beyond that, you will need a better photo.

Well I'll try to make a 3d of the room and upload it. But that will take some time. Thank you :)

Dear Mr. Gupta, I must appreciate your decision going with natural stone flooring. You have followed the right path to design. As for granite, what you've looked at is an wood grain natural granite. Natural granite come in all range of lighter shades - try galaxy white, wood grain, Norwegian shades of whites and creams etc. They all go very well in flooring as they need extremely low maintenance and take a good polish. But since you have opted for flooring, try a flamed or leather finish. However, natural stones could take up stains very easily. It is therefore recommended to choose Indian granite (harder and non-porous than imported) in off whites to conceal any stains. Regards, Aurum Ideas and Spaces Bhubaneswar