Identify a common tool used for texture application.

The stippling brush is widely recognized as a common tool used for texture application in painting. This brush has short, stiff bristles that allow for the creation of various textured effects when applying paint to a surface. By using a stippling motion, painters can achieve unique patterns and finishes that enhance the visual appeal of walls and ceilings.

In contrast, while a paint roller and a spray gun can also be used for applying paint, they are less effective for creating detailed textures compared to a stippling brush. A flat brush is typically used for smoothing out paint and ensuring even coverage on surfaces, rather than adding texture. Thus, the stippling brush stands out as the most suitable choice for texture application tasks.