A brush I use a lot to decorate my drawings!
If you use them with any colour, the tip will randomly change the tone of it at each stroke, It really helps when you are someone who cant decide on what colors to use!
You can also play with the scale of the texture if you want to change the dot's size, since the brush size will only affect the space you fill at once with the brush.

Deco Dot Brushes
Deco Dot textures