I always make calendars. It is great because if students don't celebrate Xmas or any holiday it is still terrific. I send a note home asking for special dates(b'days, anniv. etc.) of family members.
Then we do a month by month calendar. We decorate eah month and add dates of special holidays and thier special dates. When all 12 are done we get a larger piece of poster board and mound them all with brads. They decorate the bottom of the poster board. I put a hole at the top and some string or yarn for hanging purposes. It's terrific, homemade, personal, and it teaches them all about calendars which they need. i've been doing it for years. Oops I also put their picture on the bottom of the poster board.