I recently went to my son's first grade class to do an art demo. They have been drawing monsters in oil pastels, and getting their inspiration from "Where the Wild Things Are". I decided to add a few monsters to my collection for the occasion, and to make each first grader a mini monster card. For these, I just made a bunch of watercolor splatters, and then tried to find the monsters within with a black pen. I added some kind of texture to each one because the students are working on visual texture. I grouped some of my favorites into one poster (available here).
I also tried some ink blot monsters, using a drop of ink and blowing it out with a straw. I then added the body and face, and a background.