Illustrations are vector graphics drawn in Adobe Illustrator or programs like it. Once the vector is ready to be used it is then exported into SVG's (scaleable vector graphic).
This step type is easy and powerful to use. Take options you have set up with a list of illustrations SVG'S, [Vector] and give users the ability to add them to their designs and change all colors to suit their tastes.
Some examples of illustrations are:
Mostly used to either add clipart illustrations to augment a design or more creatively to add detail and vibrance to the product desgin.