skins-1.5 used to contain an amethyst folder, for a really old skin
However, its images were used by a quite common gadget
http://es.wikipedia.org/wiki/Usuario:Axxgreazz/monobook-full.css
And thus many people have references to it on its CSS http://es.wikipedia.org/w/index.php?search=amethyst+axxgreazz&fulltext=Search&ns2=1&ns9=1&ns12=1&ns100=1&title=Especial%3ABuscar&advanced=1&fulltext=Advanced+search
So please restore that folder.
Last version on svn seems to be http://svn.wikimedia.org/viewvc/mediawiki/tags/REL1_5_RC1/phase3/skins/amethyst/
Version: unspecified
Severity: normal