Try implementing comics, games or toys in your next meeting.
Snacks work well too.
Basically, the more informal your meetings, the more fun they'll be to attend. For a small dose of humor, show a comic strip related to each agenda item or topic you introduce. Dilbert is great for poking fun at meetings and other aspects of corporate life. If comic strips aren't an option, share humorous quotes from famous people during your meetings. The Internet has a plethora of sites dedicated to famous quotes, so finding something that relates directly to your agenda topic will be quick and easy.