I'm currently in the middle of one such attack (my car is filled with bags and boxes full of stuff to donate.) While I was cleaning out the living room I decided to take a few hours and rearrange. Which a minimum amount of effort, I made it a bit more inviting and comfy. It seems to work a bit better now and looks more professional.
The tulip table I bought months ago has finally been reassembled. It's not the best use of a dining table, but it will do for now.
Instead of buying new throw pillows, I just whipped up some new ones using an old striped sweater and an old Urban Outfitters bed coverlet.
I also dug around my fabric stash and found some awesome old IKEA fabric that I am going to use to finally cover the cushions of the Danish modern chair I've had for years. When I leave this apartment this chair will go with me, so I am going to take my time with this one and make a sample using muslin to get it right before I use the "real" fabric.
I recommend spending an hour or two and rearranging a room in your home. It can make a huge difference.