No accent walls, please. They are for people who can't pick art, and/or who don't know how to choose colors which which to accessorize pillows, rugs, objets d'art, etc. The sofa, chair and bench in your photo are fine, but the throw pillow covers are a serious snooze. And please re-think gray as an accent color, it is neither cheerful nor hospitable. If you like ecru. you can have pillow covers in that color with a lot of texture, something along the lines of a cable knit, like an aran sweater. Williams-Sonoma has marvelous throw pillows to give you some inspiration. Look how great those plants look in the photo, green would make a great accent color, and you can add touches of black to ground the room and add sophistication and drama. You can have a black tray on a table, some black and green in art.

I have a living room that measures 17 x 24. There are 2 windows to the north, a bay window to the east and a window to the south. We live in a cold climate so we are getting carpeting that is cream and taupe color. My adjoining dining room is a warm green with a tile floor that has shades of browns, taupe and hint of black. I also have oak woodwork. My curtains are cream with a beige/taupe design in them. They are pretty new so don't really want to change them

Hard to suggest without knowing if you want light or dark and your color scheme. The article below includes some BM colors and also has pictures to help envision the room. Also consider the important points being made. https://www.kylieminteriors.ca/update-dark-wood-trim-with-the-right-paint-colour/

Pick a color from your furnishings, either from your art, or an area rug, etc, and paint your accent wall that color. Its hard for anyone else to suggest a color, since we cant see any of those things in your pictures.