To illustrate my point, I'm going share with you some really ugly wall arrangements (and crappy photos) by yours truly. One wall in my living room has gone through many changes.
This is what I hung up when we first moved in, yikes. Mostly I used items I already had, and then I spray painted a couple of thrift store finds. It's not good.
Here's what I did next, I decided I needed some bigger pieces. Better I guess, but still scary.
After we bought our sectional, I added to the arrangement. It stayed like this for awhile, but I wasn't truly satisfied with it.
And this is how it looks now. Much better from the original crap fest. But I'm sure I'll change it again eventually.
This just shows how it won't kill you to experiment a little. Yeah like me, you might go through some fugly arrangements; but eventually you'll find something that works.