I would save this one for older kids as although there are a couple of egg backgrounds they are reused for multiple letters and so not unique.
Another free download this time for numbers rather than letters is from Confessions of a Homeschooler. (lots of activities on this page - the Easter Number match is about halfway down)
We tried this one last year but it was counting so B would have none of it! This year at the grand old age of three we will try again but i won't hold my breath. Again the backgrounds are not unique so the very littlest ones may struggle.