I’d go bold and colorful. I little bit boho, adding some fun pillows, throws, plants, etc. :)

https://www.rugsusa.com/rugsusa/rugs/rugs-usa-iris-fading-oriental-medallion/Navy/200KKCB26A-P.html

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This one is my favorite —

https://esalerugs.com/blue-8x11-santa-fe-area-rug-33146072?pos=12&rt=aisle

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https://esalerugs.com/red-7x10-serapi-area-rug-33117904?pos=10&rt=aisle

what awesome art you have. just love it. I like a bold colorful look too, but you could go for bold but less colorful too by bringing out the black in the art

https://www.rugsusa.com/rugsusa/rugs/rugs-usa-freckled-stripes-tassel/Beige-Multi/200STGL02A-P.html

https://www.rugsusa.com/rugsusa/rugs/rugs-usa-scandinavia-diamond/Black/200MTVS174A-P.html

https://www.rugsusa.com/rugsusa/rugs/rugs-usa-irregular-parallel-bars/Black/200MTHM05A-P.html

Oh wow!!!! I love both options!!!! thank y’all so much!

As a rug designer myself, I would suggest muted color rug in light blue or sage. But you need to change pillows in the same colors. Size of rug has to no doubt be 8x10.

In case you don't wanna change the pillows then I would suggest beige off white similar to that of your pillow and sofa.

If you just buy any medium to loud color rug it will disturb the color balance of the room. Which is currently all beige with some chocolate hints,

heres a few more neutral rugs. nice.