I love our yellow walls and black and white tiles, but this basement room gets cold in the winter and would benefit from a rug on the floor in front of the fireplace. What would go with our color combination? (The futon bunk bed on the right will probably (hopefully) disappear soon. The room is undergoing a makeover!)

Also - I'd love to place one or more picture rails on the wall above the fireplace, but am not sure where to place them nor how long to cut them.

Thanks in advance!