Gogo: if you're not already doing so, consider using the 'pool wall' wall covering under masonry, as its cheaper than the flat wall and essentially the same, if you put the same texture on both channels.
Also, there is a wood flooring that's essentially free you could switch to. It would be an all around improvement as well, as I think the carpet color clashes with the rest of color scheme.
Consider painting the window frame the same color as the exterior and interior, so they blend in. This kind of style benefits from cohesiveness.