Ideas for last class together after 4 years

[lloyd23]

It's my time to leave and I need ideas on what to do for my last class.  I've been at the same school for 4 years and want so do something special but can't think...please help me!

[0mnslnd]

Let students bring and write on each other's shirts. Old t-shirts of course, preferably white. You included.
Play some cheesy farewell music on Youtube, like Time of your life by Green day.

If bringing shirts is impractical (e.g. many students might forget) you can always let them fold t-shirts with paper. (again, try youtube for a demo). A3 paper for more writing space.

[woman-king]

Do you have photos of you and students together or at school events?  A little farewell slideshow might be a nice idea. 

And some kind of short but very heartfelt speech about what your time in Korea has meant, things you've learned from teaching these students, etc. will be very appreciated.