There are many ways to create texture on canvas. Joint compound, available at any home improvement store, has a similar texture to molding paste. Although it does not seem to be quite as dense.
The small circles you see were made by pushing joint compound through punchinella or sequin waste. The squares were created by pushing it through hardware cloth, also available at the home improvement store.
The larger circles are from a short wood tube I found in the studio while working. After waiting for the compound to dry, I had fun dripping different colors of ink onto the canvas. I am happy with the results of this experiment.
Click on photos to get a closer look and feel free to leave comments.