Bart is super into Christmas so anyone may have noticed the path to their cabin free of snow, their drinks refilled without asking, their...silent walks slightly disrupted by slightly off Christmas caroling. He's also poor so everyone has gotten lovingly speedily drawn comic issues of their adventures (sometimes other things)
Artemis - basically Robin Hood: Prince of Thieves but with girls and no romance
Barnaby - Christmas cookies (slightly burnt)
Cass/Batgirl - a ninja meets ballerina genre comic that has no words except for charades and is basically one long excuse for awesome action scenes
Dick/Robin - adventures with Kid Flash that do not involve any tongue :|
Jaime/Blue Beetle - a blue and black friendship bracelet and a comic about dinosaurs vs giant alien bugs
Kara/Supergirl - a magical adventure with flying ponies. That breathe fire and need to save their kingdom from idk mutants. And he made her a hair scrunchie.
Kurt - a comic about a teleporter which has no transition and is really just a lot of background pictures looking interesting (one is even in space)
Molly - adventures of Princess Powerful with Chase, Gert and Old Lace only Chase's dialogue is mostly just "dude" and "that's silly" with some creative license
Red Arrow - Artemis's archery copy but with more guys traced in
Ricochet - an adventure that's basically him copying the really awesome movie paintings he sees in the Video-O-Rama and Rico kicking robot nazis around
Superboy - adventures with him vs flying sharks. Also copies of "Wendy the Werewolf Stalker"
Thor - a comic about vikings with some Shakespeare lines copied in the dialogue
Tim/Red Robin - YJ extended adventures (where Bart suddenly has all his plans make sense) and Christmas pie with marshmallow on it
Wally/Kid Flash - an 80 page giant where he has amazing speedster adventures with Barry and the other speedster clan members. Some of it is based on history but he's been careful to write down "IMAGINARY ADVENTURE" everywhere. He also gets Bart's old Tessertetris game.
Yzak - herbal shampoo, which is really just his shampoo but with added flowers crushed in
Zatanna - ...peeled baby carrots for the rabbits he assumes she keeps in her hat, and a handkerchief, then a comic about MAGIC MYSTERY (spoilers: the butler is magic)
BUT IF YOU'VE CHATTED WITH BART BEFORE AND KNOW EACH OTHER YOU GET SOMETHING, if I forgot I'm blaming the flu