I don't know about your students, but my preschoolers BEG for homework. I am very wary about sending home worksheets due to the fact that learning at this age really should be through hands-on activities, but I created this to send home with my kiddos.
After teaching the upper- & lower-case case letters I start sending home this document to help students learn to differentiate between the letters.
This is a WORD DOCUMENT that uses Comic Sans font. It is 100% editable to fit your needs-- you're able to change the letters as you see fit and as needed.