A topic for every kind of blank page
One wheel covers a lot of stuck moments.
Use the conversation set as an icebreaker or a dinner-table prompt, and the debate set for a class motion or a practice round.
The writing set helps when a story will not start, and the drawing set when a sketchbook has been open too long.
Science, history, and tech give you something to research or explain, and the funny set is there when a group just needs to loosen up.