Answer: Nothing! Does that picture of a rabbit with eggs make any sense at all? Yet think about how many churches allow the death of Jesus to be tied to bunnies and colored eggs. Is this something that a Christian should participate in at any level? Or should it be avoided as something that obscures the real meaning of Christ's death as our Passover sacrifice?
If you are really interested, it's easy enough to do a Google search for history of Easter. When you read the truth—well known to scholars and historians and anyone who does a little research—it will open your eyes to see just how much confusion and even deception surrounds this most important of all sacrifices, which our Savior made for our benefit!