Lots of Milka:
Really, lots of it (it's not even the Christmas chocolates!):
There's always the group of women who love pretty paper napkins, so there's something for them:
For those who bake, there's all sort of stuff that's standard here, but sometimes hard to find in the US:
I didn't include pictures of the beer and wine section, or the mustard section, but they're great, too. When my dad was in Germany hosting some Spaniards here for a business trip they were asking for a certain German mustard that was semi-sweet and impossible to find in Spain. I took them to a German grocery store and they all went home happy with armfuls of Händlmaier's (typical sweet Bavarian mustard). So the grocery store really is the spot to go. There's something for everybody!
For more souvenirs, head over to Spain Daily.