Psychologically for me it makes a difference that it's not so much matchy art, but that the art inspired the fabric. This might sound odd, but I'd be interested to see the sofa and chair mostly in Arbre de Matisse but with the seat cushions in Fez II.

Is it overkill? Depends on the pattern in the rest of your space. I love bold pattern, staircases included.

Get yourself a good quality Oriental rug in a style and colorway you like, either a knotted Persian or a woven Nomadic or Caucasus type. Then you can get your ottoman in a color and fabric that works with your sectional and your rug. By the way, if you think people will really be putting their feet up on the ottoman, you might want to think about getting a leather ottoman. It holds up very well, looks substantial and goes with everything.

You have two feet in three boats. Navy and white on the walls, a drab rug that isn't sharing the feel of the paper or the fresh clarity of the navy and white. You will have teal cushions on white oak chairs. Where are you trying to go? Cheery? Are the stools staying? I assume they are, since you are also changing the light. I think I am confused as to the look you want. : ) To answer the question? Not that rug with the paper, and perhaps NO rug at all. The area is too small to get one large enough to not be in the way of stools at the peninsula. Maybe re think the paper........to acknowledge the chairs. I see no need for any rug. Consider how and where you will begin and end wall paper as well. Maybe some more pics of the entire space, and some inspo of the feel you want. That teal???? Maybe consider ART...............INSTEAD : )