This is a teacher led lesson where the class (or groups) will brainstorm different ideas for creating games, animations or anything in Scratch.
The goal of this lesson is to get students to come up with their own ideas, discuss and develop them with the group. Collaboration and group participation should be encouraged. Even if a student doesn't come up with an original idea of their own, they might have their own take on someone elses idea.
If there are a large number of students then they can be split into smaller groups of around 5 to brainstorm and discuss ideas within the group.
Remember, there are no bad ideas!