One method is to brainstorm topics.
Check out this example of a topic brainstorm:
Some people find that brainstorming on paper helps them think through their ideas, others like to talk about their ideas with a friend, while others use technology to think and record their ideas.
Here area few technology tools to try:
WallWisher (no login needed)
bubble.us (no login needed, and should be able to print finished clouds)
**Must use the CHROME BROWSER!**https://bubbl.us/
Chrome image from www.google.com