Although I'm an English teacher by day, I'm an artist by night. I decided to convert some sketches I did for my sons into robot clip art. Included here are PNG files of gears, a line drawn running robot, a robot artist, and a robot reader.
My style is somewhat whimsical. Because I teach high school, I like to be able to use my work with older kids as well. However, it is perfectly appropriate for lower grades.
Although I will be uploading various clip art batches as I make them, I am open to creating more specific types of images at your request.