For years, I've been using the 'Calico Cat' image that ships with OS X for my account.
Since upgrading to Mountain Lion (maybe since Lion?) the Login page has larger round account images, and it shows the 'Calico Cat' image as a rather stretched and fuzzy rendering.
Is there a way to fix this? Did Apple simply not provide a higher res version of the default account images? If not, this seems like an oversight, Apple used to be very conscious of such things, for example, I know that every application icon has an embedded hi-res version it's image.
Any suggestions are welcome. Thanks!