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!
Home theater room in the attic. A more do-able idea than those other fancy home theater rooms! Much cozier and warmer than the individual recliners in rows that you see in a lot of fancy home theater rooms
For the office? Paint pipe a bright metallic and the wood a washed color? V Scaffolding Boards and Dark Steel Pipe Wall Mounted and Floor Standing Industrial Chic Shelving/Bookcase - Bespoke Urban FurnitureDesign