The best souvenir from the European Christmas Markets – mugs! At least in years past, each market had its own distinctive mug. You can purchase your Gluhwein or hot chocolate in a mug to keep, or just get a clean one (about 5 Euros each, easier to stick in a purse or backpack and pack to take home). When I use them at Christmas they are quite a conversation-starter and no one forgets which mug is theirs.