I'm looking to do a craft for my son's birthday that involves making robot t-shirts. I'm thinking about making the robot on the t-shirts ahead of time and then they can do the face and buttons, on front, etc. They could paint, but they're all about 2.5-3 years old and I'm thinking if I could find something that I could cut into shapes, they could assemble the shapes on the robot and they I could iron it, that that would work out pretty well.
Does that kind of thing exist pre-made? Kind of like iron on pant patches, but in larger quantities/more colors?