Great back to school idea! This would make a really special end of year memento for your students and parents.
Take a photo of each student holding the "My first day of year __" sign. Get them to do a writing sample of what they like to do, what they want to be when they grow up, their goals for the year, etc. Keep these safe until the end of the year! Before the last day of school, take a photo of each child holding the "My last day of year __" and get them to repeat the writing. It would be an amazing thing to see the progress from the start of the year, to the end of the year, side by side.
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Reception, Prep, Kindergarten
And a general 'first day'/'last day'
You might also be interested in:
60 Ways to End a Lesson: Ideas for Plenaries
Daily Vocabulary Stretches
Visit my blog for more ideas at Little Leaps of Learning.