kim, look at Etsy for artists. there are so many, so narrow it down to the type of look or colors or medium. And, they will do any custom size, colors or subject.
you could actually make something like this one doing an acrylic pour. look it up on Pinterest. start with a large enough canvas (or two of them) and some acrylic paint in whatever colors you like. create something. I've made a few of them.
i mean, the color in this one is perfect for your kitchen
yes, you can buy these on Etsy. just figure out what size you want, and find something you like, and one of the artists on there can come close to what you like.
take some painters tape and mark out what you think would be a good size for that wall. don't make it too small.
overstock has some colorful selections
https://www.overstock.com/Home-Garden/Gallery-Wrapped-Canvas/Large,Abstract,/size,subject,/29436/subcat.html
https://www.overstock.com/Home-Garden/GreenBox-Art-Culture-Abstract-Wilderness-48-x-24-inch-Stretched-Canvas-Wall-Art/14706249/product.html?refccid=UD4BDXYW26SZCHCP3F6BE4THGI&searchidx=0
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