Pillow room: don't spend money on couches or lounge chairs and buy a really nice movie screen. (This would be really fun for movie night, to just move all the living room furniture and bring out the pillows!
Must have that ceiling if we do an office/library and maybe even bring out the ladder to place push pins on the map ceiling. Then you can lay down, look up and see everywhere you've been. - library/lounge or office
reading corner nook with window seat and built in bookcase : Decorating Your Reading Corner. decorating a reading corner,decorating ideas reading corner,home reading corners,reading corner decor,reading room decorating ideas
Rows of matching Billy bookcases from Ikea work well here. Consider that the books and accessories offer the pop while the bookcases provide the background. (contemporary living room by Smith & Vansant Architects PC)