The divergent thinking mini-project is a chance to get students to embrace creative constraints. This is a shorter maker project that you can do in 1-2 class periods.
Genius Hour (also called 20% Time) is a chance for students to engage in an inquiry-driven, independent project. They own the entire learning process, from the concept to the questions, to the research, to the project management to the ultimate final product
This should take 5-10 class periods and is a great way to introduce PBL at the beginning of the year.