mScara is a SCARA (Selective Compliance Articulated Robot Arm) driven by stepper motors. If you install a pen on mScara, it can draw pictures on a flat surface. Replacing the pen with a laser diode, it can turn into a desktop laser engraver.
mEggBot is designed to draw on things that are improbable to print on, such as eggs or ping-pong balls. It can be used to write letters or to draw expressions on eggs, or to draw Easter eggs.
mSpider is a drawing robot which can draw pictures on a wall or a white board. Two stepper motors control the movement of mSpider though strings. Theoretically, it can draw in a huge range by increasing the length of strings.
mCar is a three-wheel robot car. It contains two stepper motor drive wheels and a ball caster wheel. It can draw its own movement tracks on the surface. If you install a chalk instead of a pen, it can draw on the floor.