We have all cream colored walls, and solid chairs and sofas all in the brown and tan family...Except for a outrageous red chair in our family room. I love the splashes of red with the tans and Browns. I love pillows and dress up the chairs and sofas with pillows. Heck, even our throw pillows have throw pillows.. including our DR chairs they have throw pillows as well. :) Most of them are needlepoint with some tapestry pillows. I change them around often. I have many in reserve. I also love animal prints. This is the LR and DR area. The family room has a leather sofa recliner, Two leather chairs, a red chair and yup, lots of throw pillows.

Any big store that sells furnishings will have catalogs that will show interiors full of their decor etc, displaying different options in a pleasing way, and giving you all sorts of clues of what goes with what. Whether it's Ballard Designs, Pottery Barn, CB2, West Elm, Anthropologie..you name it. The main problem with it-you don't want your room to look like a catalog one..:) The companies show their products. Your house should show you..which is much more interesting and complicated. So take clues from the pics, and then hunt stuff, partially, elsewhere. And especially look everywhere for art that touches you deeply. Look at it like a book..since that what art does-it makes us feel and think things, it transports us, it can even change us...would you match a book exactly to your decor? no, right? (tan and grey look great together. lots of beaches are a bit tan, grey, and a lot of seafoam..))

Check out the artist Brit Bass Turner -- her prints used to be on Etsy, but now she has her own shop/website. Her art is abstract, prints are relatively inexpensive, and the colors she uses go with everything in the pics you posted above. Hope this helps! https://www.brittbass.com

Artwork doesn't go with furniture! Artwork has to stand on its own. As ART. No Chinese sweatshop 'wall art' from online or a décor store. No giclée prints of oil paintings. That garbage is for dentists' waiting rooms and car dealers showrooms and hospital corridors. Not your home. Buy something meaningful to you. Buy something real. It doesn't have to be expensive, but it does have to speak to you and say something about you. It could even be posters of art festivals you attended, photos of places you've traveled to. Anything that's real.