We just got approval for our easy Enrollment Add-on for the Fordson theme. This add-on will work with any theme but is integrated to make things super easy in the Fordson theme.
The easy enrollment plugin allows teachers to use 6 digit codes to enroll in courses and groups within courses. Once the Easy Enrollment plugin is activated, the Fordson theme displays an enrollment form for students on the homepage as well as an easy to find button on course pages to show the class enrollment codes to teachers.
https://moodle.org/plugins/browse.php?list=set&id=84
The Easy Enrollment plugin will also generate and read QR codes if you have SSL activated on the server. This is a cool feature if you are working with kindergartners or really young students. The teacher can print out the QR code and walk around the room and wave the paper in front of the computer camera and instantly enroll the students.
Easy Enrollment Plugin