I made this set (and another set which I'll upload in another post) to let my students know what topic they have to work on for their lecture day and help them get started.
You can cut out the cards and give them to your students randomly and then ask them to read out the numbers in the orange boxes so that "you" know what each student is going to talk about while the topic remains a surprise for the rest of the class.
Set dates for them to get prepared. Ask them to give you a quick demo before the appointed time and give them further instructions.
You can customize the topics and the guidelines to go with the level, taste, culture, etc. of your students.
Hope you find them useful.