Give them to the charity shop nearest the school with the packaging and more importantly all the little messages written by the children still on them - they were packs with to / from panels on the side
I noticed them this morning looking for a coat for DD. 10 mugs all with little messages eg - to Mrs X thank you for being a great teacher love X
DDs in that teachers class this year and while I don't give mugs as I don't like them it puts me off buying her anything at all I usually give teachers wine