Another advantage of using wall decals is that they are highly customizable - you can install them however and wherever you want. There are many different styles for wall decals that are available everywhere. In this case, this huge gold heart shaped decal from Urban Walls was used as a "statement piece" for an office.
There are also patterned wall decals that totally look like wallpaper. I like the triangle decals in the photo because they make the room look fun.
Wall decals are easy to apply as long as the surface is clean. It will stick to almost any kind of surface. And if in the future you change your mind and decide to replace them, you can just easily peel them off. Also, they're easy to clean. Since wall decals are made of vinyl, you can just wipe them with a damp cloth.
Here's another patterned wall decal: plus signs. The black plus signs look cool against white furniture. It looks clean, but it shows a lot of contrast.
And here is one of my favorites: Gold polka dots.