The RIGHT wallpaper can be a great solution - since you are building a house you will have a lot of design decisions to make--they should be made as a unified whole not as seperate decisions. This is a job large enough to bring in an interior designer--bring one in NOW -it is best to have a designer before or during the early stages of construction. Position of lighting, wall sconces, etc need to be decidec BEFORE the walls and ceilings are sheetrocked. PyramidDG.com

add a mirror in each niche, use a nice wallpaper behind it and simple curtain blinds will make it interesting. Use a highlight paint on ceiling to match with wallpaper

Abhishek, Not sure what you are referring to as mirror like finish here. Please highlight or mark it. Walls seems to be treated with wall papers here. Thanks Nitin Cornerstone Designs, Bangalore.

Hey Aly, One surefire and easy thing to do - a gallery wall. You could intersperse this with shelves and perhaps a couple of wall light fixtures! The rest of the ideas are already given to you! Wallpaper, Painted wall or full wall custom built TV unit. We hope this helps! Best, CUBSpaces Team