Etched Glass with etching cream. Also works with contact paper, although cutting that with an exacto-knife can be tricky. Make sure the cream later is thick enough, because touch-ups don't work as well as one might hope.
How To: Make Your Own Mod Eames-Inspired Drinking Glasses! by Capreek via curbly: Make your own version with etching cream! (Be sure to wear gloves and work in a well ventilated space.) #DIY_Eames_Drinking_Glasses #Capreek #curbly #Etched_Glass