Here are some great (free, printable) calendars for your classroom or homeschool. Right now there are three months ready -- January, February and March -- with more to come soon. Each month has two parts: the actual calendar and a top portion that has fun events and important holidays.
These can be colored and used to decorate the calendar. If you want to make them into stickers, have the children color them and then use this recipe for making stickers and stamps.
Woman's Day Magazine: Calendar Corner