Some popular wall painting designs for a bedroom renovation include solid colours, geometric patterns, stripes, floral prints, and abstract art. Neutral tones such as beige, grey, and white are popular choices for a calming and serene environment, while bolder colours like red, blue, and green can add a pop of personality to the space. Different painting techniques like stencilling, ombré, and colour blocking can also create unique and visually appealing designs. Ultimately, the choice of wall painting design will depend on personal preference, style, and the overall theme of the bedroom.