Big Blue Wall

Long Before, even old carpet:
After:
There is "Merced River".
On the far left, you can see a bit of the tan "Summer Memory" peeking through.

Long Before, very long, you can see the sponge green even! That light fixture was short lived there, then moved to the entry way.
After:
Now I need help. Bad.

WTF do I put on the wall? Seriously, it's a big, blue, EMPTY wall. Before over the kitchen table the entire wall was wallpapered with Con's art work. And in the living room, the TV was there. Now it's so empty. What do you even do? Can I get away with nothing, and the blue can act as its own artwork?