Benzine

Is it common practice for art teachers to make grad mugs in the US?

no, but often a courtesy and sign of respect.

I usually end up with 15-20 a year, but always have. a few extra. I'm trying to include a letter tile opposite the handle, for the student's first initial.

Min, I've almost always done mugs, because I want to give the student, something they will be able to use, and have for many years. Especially being as young adults seem to survive on cereal, coffee, Easy Mac and Ramen. So the mugs i make work well for all of those.