I rearrange my furniture all the time....my hubby used to get cranky about it but after 13+ years he has become accustomed to it! I love to do it and sometimes I just need a change and this is the simplest (now that I have decided to leave my hair alone for awhile) and cheapest thing I can do. I rarely buy anything new but when I do it is usually new candles and throws/pillows for the couch.
I pretty much do what you do, utilize whatever I already have and take things from any and all other rooms. I have found that after many years and lots of kids, I like the minimalistic type look, which is very hard to accomplish at my house due to all the toys but I try none the less.
The one room in my house that has to be perfect is our living room because it is where we spend most of our time and it is the room that any company spends time in as well....unfortunately for me, this is also the room that has the least amount of room for change due to the fireplace, the big picture window, the stairs and the cable outlet...but I have rearranged it in every possible way, which is only 4 different ways but I usually change it with the seasons, none the less!
My hubby just built me shelves in our closets in our bedroom and I am currently contemplating taking out our dresser and moving my bed at an angle and mounting the TV up on the wall...haven't tried it yet, but it will be my next "change"....I think if we take out the dresser and buy a new chair we will have lots of room and a "reading spot" for the hubby!
~If your hubby does get cranky just make sure you point out the obvious...what ever room you have rearranged has gotten a thorough cleaning:)