Look at your walls. If you are like I was, your walls are fairly bare, because when you think of putting something up on them, you feel like, well, what if you make a mistake?
Listen. Don't worry about making a mistake. If you see something you like, buy it, and put it on your wall. You will be a much happier person.
I want to tell you about my friend Noah. He is an amazing photographer, and that is not something I say lightly. Check out his portfolio. When you see something you like, be bold and buy it. You will not see art that is this good, for this good of a price, anywhere else.
I'm going to tell you a secret. When you see one of his photos, and you say "Wow!" to yourself, you're still going to say "Wow!" to yourself 5 months from now when it is hanging up in your house. Every now and then I pass one of his photos in my hallway and I just stop and stare at it. And I've had it up on the wall for three years!
And if you don't see anything of his that you like, go find something you like and buy that instead. Or if capitalism isn't really your bag, you can go get a big piece of poster board and paint a picture of a dolphin or a giraffe or Elvis or whatever floats your boat and hang it on your wall.
Surround yourself with beautiful things. Life is too short for blank, off-white walls.