I'm always on the look-out for creative ways to engage my adult students. Puzzles, believe it or not, are one way I've found to foster fun, thinking, and discussion in my adult Bible study classes.
I've used brainteasers, optical illusions, word art, and jigsaw puzzles for group projects and discussion starters (much to my students groaning delight). :o)
I used to spend hours putting these things together or hunting for them on-line. Now I've found a great tool for creating these things in a snap.
Sponsored by the Discovery Channel's DiscoverySchool.com, the site is called Puzzle Maker, and it allows you to create (in almost an instant) several different types of puzzles on any subject.
These services are free and printable for your teaching/leading use.
I suspect I'll return to this site often!