A personally arranged picture wall is always a good idea. Adds so much character to a room. Make sure you leave other walls clean though, in order to let the room "breathe".
Source: 1. Stadshem, 2. styling Josefin Hååg / photo Kristofer Johnsson, 3. styling Nathalie Schwer / photo Line T Klein, 4. Steinunn / photo Emma Fexeus, 5. Jonas Ingerstedt, 6 & 7. at my casa, 8. Linnéa Svan / clipboard, 9. Bolia
And if you're not sure about how to display your art, this might give you a few ideas: