I want to change the color of a single wall in my room to create an accent wall. How can I change the color of just a single wall?
An individual wall's color or material can be adjusted using either the Wall Specification dialog or the Material Painter tool.
Note: Although the instructions in this resource discuss changing colors and materials, it is recommended to adjust, change, or create a new Wall Type if the material that is replacing the original material has a different physical thickness (e.g. vinyl siding to brick). To learn more about Wall Types, please see the Related Articles section below.

A feature introduced in X17 is the Material Builder, which allows you to create your own materials. For more information, please view Video # 10301: Custom Tile & Materials - New Material Builder.
There are a variety of different Material Painter Modes. Each mode specifies how broadly or narrowly the selected material will be applied to surfaces in your plan. In addition to the Material Painter Modes, the Blend Colors With Materials option allows you to apply a solid color to a surface displaying a pattern or texture and blend the two. Please see the Related Articles section below for more information on these tools.
In some cases, such as when an exterior wall runs the length of several rooms, or you want to apply different colors or materials to several different sections of the same wall to create a striped effect, you can use break points.

If you are in a 3D camera view, return to your 2D floor plan view for the following steps.
Note: If you would like the Add Break edit tool to remain active, you can turn on Sticky Mode in your Edit toolbar so that you can continue to place as many breaks as needed. When you are finished, choose a different tool, or press the Spacebar key on your keyboard to return to the Select Objects tool.
The Add Break tool applies a break in a wall. Once a wall is broken, the two wall segments are separate walls that can be modified independent of each other. If a break point is placed near the intersection of two walls, the break is positioned at the center of the intersection. Walls separated by a break can be rejoined. Select one of the segments, click on the end edit handle located at the break, and drag it a few plan inches (mm) away from the break.
If you notice that collinear wall segments are rejoining when you attempt to adjust the length of one or more segments, consider disabling this automatic behavior on a temporary basis. This can be done within the General Wall Defaults by navigating to Edit> Default Settings, expanding the Walls category, selecting General Wall, then clicking Edit; uncheck the "Auto Merge Collinear Walls" option, then click OK and Done.

Another solution would be to draw a Wall Material Region
in the desired area, though this adds more than just a color to the pre-existing wall surface, and is better suited for facade walls. Please see the Related Articles section below for information on Material Regions.