This time of year there are some pretty amazing craft-tastic ideas online and in magazines, making it entirely possible to devote days to creating museum-quality ova, but I prefer a less design-y and more rustic approach
Use for addition, subtraction -then discover how to set up for multiplication Math Facts Baseball - Practice addition and subtraction facts! There's a great statistics lesson in here too. This would really be a great project for any elementary grade.
Do you want your students to "Print Like a Jedi Master"? These pages get the job done. The entire alphabet and diagraphs await you, as does the secret weapon to winning the battle for great printing! May the FORCE be with you!
A great visual rubric. It is so important for students to see models! Using a rubric scale to compare weak and strong writing models is a great way for students to begin to reflect on their own writing!