I love wall art. I don't have a ton of it in my house or anything, but I still love looking to see what's new in catalogs or what not.
It's hard to get an idea of what would look best without seeing the decor in your room. But you can't really go wrong with a framed mirror. Make sure it's rounded or octagonal - not square (good energy.) Shadow boxes are pretty cool. Keep them simple.
These are two of my most favorite pieces in the house. I prefer 'unique' and 'cheap' lol. Don't remember exactly how much I paid for each of these, but I promise you I didn't drop more that $25 / piece.
Don't know where you live, but I
highly recommend checking out TJ Maxx, Marshall's, Big Lots, Garden Ridge and Old Time Pottery. I have my best luck at these places for unique, cheap home decor.
Hope I helped somewhat lol.