Our theme for our grade level this year is "superhero." So we are using primary colors with the super hero font. These are the Month words, days of the week and the number cards with primary colored border. I also have holiday and no school labels for days.
Clarification: They do not have superheros on each piece because I found it very distracting for the primary kiddos. So if you are looking for a calendar set with actual superheros on each piece this is NOT for you. All this set includes is the primary colored border and super hero font.