Well Marty is going to give most of his CR a mixtape of music that he thinks would fit them (Spoiler, it's all rock and metal music from the 50's to 80's). Strong Bad however will get a special mixtape that has Marty singing the songs, with a note saying that he can give him a normal tape if it seems too narcissistic.

Arcee will also get a bag of catnip because Marty highly doubts that Arcee would want a mixtape and he doesn't want his eyes clawed out for Christmas/Hearth's Warming.

Marty would also like music, video games, movie-type stuff, or soda if anyone wants to give him all of that for the holidays.