Consider starting with an original painting to design your room decor. Notice how a painting is used in decorating a room in this article from Houzz.com Room of the Day: A Painting Sets the Tone
Now try a simple plan for your room.
- Look at the colors and amounts of each color used in a favorite painting of yours.
- Then choose similar proportions of the colors in your room elements such as wall coverings, paint, fabrics, flooring.
- Be sure the color amounts are not all the same.
- Use the accent colors in pillows and accessories.
You don't have a favorite painting? Search for one on line and use its colors for your inspiration. Have fun and let me know if this helped you.