I’ve just found an entry for a delightful looking study on PubMed entitled ‘Size of Easter egg drawings before and after Easter’.
Unfortunately, the paper isn’t available electronically so we’ll never know whether the Easter egg drawings grew, shrunk and stayed the same over the Easter holiday.
However, we do know from a 1993 study that the famous rabbit / duck ambiguous picture is more likely to be recognised as a rabbit during Easter.
Link to entry for ‘Size of Easter egg drawings before and after Easter’
Link to entry for ‘The Easter bunny in October: is it disguised as a duck?’
Mind Hacks 