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.

planning to change the floor cushions to go with the curtains. can't decide on the colour combination, any suggestions will be great.

Well it depends on your wall color as well . since you have such concrete looking floor I would recommend you can chose any electic color like lemon , orange , yellow to give a bright look and uplift room mood or chose any pastle color of your choice for subtle feel . :)

Adding a nice wall art would bring the room to life. Depending your liking either a collage of photographs or a single big photograph art or even a wall paper to the white wall. Check www.dahuez.com or www.facebook.com/dahuez