Mercy: Malcolm got clothes. They are exactly things he would have picked himself, but she found them in places he wouldn't look. Dad got booze. Alexander Greengrass got a nice dark green scarf. (Mosiah Capper also got something but he's not here anymore >>) Demetrius got a dagger. Cat got a book of poisons disguised as a pureblood manners guide, with a couple circled that would be suitable for a husband. Also, a tin of some kind of store bought baked good. Mercy doesn't cook. Annabelle got a few phials of useful potions, all labeled clearly because some of them are stuff like pain medicine and some of them are stuff like instakill poisons. All her little DE recruits or potential recruits got a bottle of booze. All the guys she has a history with and still talks to (she doesn't talk to all of them IC, but YOU CAN MOSTLY JUST ASSUME THEY TALK) got something like a flask or a small bottle of booze or some Christmas biscuits or chocolates, whatever she thinks they'd like most.
Sariah: Mummy, Daddy, and Mosiah all got stuff. Melinda got earrings and like four books Sariah has wanted to share with her but was saving. Morag got a book about animals and a small box of sweets. S6 girls got a little makeup thing (including Melinda). S6 boys got a small bottle of booze. Sebastian's got tragically smashed in transit. Society pureblood girls in Hogwarts but not in Slytherin (if there even are any?) got a little thing of makeup or perfume.
Greg: If you're friends with Greg, he got you something. It was slightly inept but he obviously thought about it. This includes all of Slytherin 7.
Gemma: Gideon got really fancy Italian shoes. Adrielle got a dress. Other friends got stuff. It was probably clothing related unless she knows you hate clothes, but everyone got something.
Zoe: Tracey got chocolate biscuits that were filled with more chocolate. Chocolate everywhere on these things. Also these earrings and a bottle of firewhiskey. Millie got this bracelet and a bottle of firewhiskey. Pansy got a tin of chocolate peppermint biscuits. Vince got a rather larger tin of various biscuits, with a note inside to share with Greg. Theodore got also a large tin of biscuits because that boy needs to gain some weight :| Justin got a book (biography of someone cool, perhaps) and a small tin of biscuits. The note was hilariously awkward and had a lot of scratched out bits. Wayne got a tin of chocolate peppermint biscuits. Kevin got...awesome stuff. idk. Seamus got a big tin of whatever his favorite baked good might be and a bottle of firewhiskey. Dean got a flask with a D on it. Bex got earrings. Other people I forgot HOLY SHIT ZOE HAVE LESS FRIENDS: Girls got either a small, cheapish jewelry thing or biscuits, depending how well Zoe knows them and what they'd like more. Boys got biscuits or booze.