Grain and textures for brushes in Illustrator tutorial, how to add texture designs to the strokes in CC 2017 2015 etc
You can always modify / add grains and textures to the Illustrator stroke by dragging the artwork to the artboard and applying additional paths to any shape using the pathfinder tool.
You can use them with all the Illustrator brushes collection set (for CC 2017 2015 etc)
In the image on the left, a number of paths were added to create a grain / texture to the artwork before being re-added to the Illustrator brushes panel and then used as a brush stroke.
Another way to quickly add a lot of spots and textures is to use the symbol sprayer and add those sprays to the brush path and then re-define that as a new brush via the brush panel (such as save as an artistic brush). You can also use the symbol sizer tool and symbol scruncher tool to create smaller and more dense spots and textures (or any other symbols) added to the brush stroke
Another way to add grain / texture to the brushes in Illustrator is to use the live effect 'glass' and the appearance panel. Select a stroke and then go to the distort menu and glass menu option and apply a distortion (at this point you can also use a map from Photoshop).
The odd thing with the filter gallery plugin is that is does not allow for multiple filters to be added in a single dialog: a quick way around this, and a quick way to added many levels of distress effect to the stroke, is to use the duplicate effect command in the appearance panel and add more and more glass distortions to the art.
The more you add, the more likely the re-draw of the stroke will be slower though.
Or use the texturizer filter found in the texture menu
select brush set
go to the appearance panel
go to the stroke line
apply the effect / texture / texturizer filter
changing settings and add a texture via the texture dropdown and browse for a texture or use one of the default ones. Set scaling as required. You can use textures such as displacement maps for Photoshop etc (PSD files) or some of the pattern sets on the graphicxtras site with PNG files and seamless tiles.
To remove the effect, simply go to the appearance panel and use the right side menu and clear appearance