What ideas do you have to spruce up the walls some more?

What ideas do you have to spruce up the walls some more?

Hi! I lived in an apartment in downtown Seattle for six months, it was a small studio but I absolutely loved it. Now, I am moving up to northern Washington for college. I found a great apartment and I love it, but it's different because well, it's a two bedroom. I'm quickly realizing though that no matter what furniture is in there it continues to look dull. I spoke with my landlord to see if she would allow me to paint the walls, and was given a very quick and strict "no." I was curious though, what ideas do you have to spruce up the walls some more? If I can't paint them, what ideas do you have to give the rooms some color? I put photos on the walls and even that didn't help. Any suggestions would be wonderful! Thank you in advance!
As of June 27th

As of June 27th

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