Maybe these home decor ideas sound crazy, but yes, I think you could have new furniture by exchanging your old one with your friends.
I think most of us have favorite furniture that although it is broken and un-repairable, we just do not have the heart to throw it away or to sell it in flea market. We just leave it in the garage or warehouse. But, in fact we never see it again, or remember that it still there.
We just keep that furniture for sentimental reason. So, why you don't take it as home decor ideas? Think how could you see your old furniture without having them? Well, as I mentioned above, the idea is by exchanging furniture with your friend.
For example, you have an old round table, you could exchange it with a rocking chair from your friend, what you need to do is cleaning them, and maybe re-paint the furniture. If needed you could add some personal touch to it such as put a seat cover.
Of course, you could just sell the old furniture to the flea market nearby, but again, you are too sentimental for doing so, that's why you keep it in your garage. So by exchanging the old furniture, you could have a new one (refurbished one from your friend), and could clean your garage from the unused things. And most of all, you could see your old one when you miss them.
This home decor idea actually is not complicated at all, you just have to find a friend that have the same thought to make the exchange.
I always think home as a nest, like a bird that build their nest one by one, if you are willing to decorate your home by your self one step at a time, you will have a strong bonding with your home. This is what makes you always feel at home.
This crazy home decor idea simply could be explore wider, by making it as a game, you could gather with some friends, and each of you write on a piece of paper of what you would like to exchange, then put all the paper in a bowl and make a draw. By doing this game, it will be fun, have a better relationship with your friends, while you could explore your self in finding what you could do with the old furniture you win. Just be creative with what you have.