The front door can set the theme and tone for the entire house. It could just be a simple, classic brown or something bolder like a deep red. Inside, light wall colours tend to be the most popular; they work with most accessories. Artwork can really liven up a space. For the ideal positioning, have the middle of the painting hang at eye-level.
At the end of the day though, it’s your house, and the decorations only need to please you.