Blank Lessons for extra student practice or extension of the lesson

Would it be possible to add blank lessons that would allow me to give students the opportunity to practice their skills? For example with lessons like Unit 3 - Lesson 7, students are drawing a smiley face. I would like to be able to give them a blank lesson in which they could use the skills they developed with the smiley face to design their own picture with only the Applab features that are available to them at that point in the curriculum. It would give extra practice for my struggling students and provide extensions of the topic for the advanced students.

In step 10 of that lesson they get to create any picture they like. Most of the lessons like that have a final step where they can use their creativity and build something on their own. Are you looking for more than that?