If I had oodles of money I would buy all the art my heart desires and I would have more walls! In reality I have an interesting art collection that I've grown over time , but not all of my wall decor is fine art. There are so many other things you can do to add a WOW factor to your walls without breaking the bank. Here are some of my favourites.
Enlarge and frame print material
Display your collections artfully
Pinterest
Use wall paper and fabric in creative ways
Frame post cards, pages from old books, or photoographs
Spray paint sculptural objects
Hope there's an idea here for your walls.