Hi!
There is now a Special:SkinDistributor[1] on mediawiki.org that will allow you to download tarballs of skins that are hosted on gerrit. Since skins have moved out of the core repository and handled like extensions as of 1.24, it's now possible to provide an easier way to download them.
In addition, I discovered that the tarball generator (for both extensions and skins) was including .git subdirectories in the tarballs it was creating, causing extremely large tarballs depending on the history. It no longer does that[2], shrinking tarballs by over 100MB in some cases!
Thanks to Chad and Yuvi for helping with code review and the deployment!
-- Legoktm
[1] https://www.mediawiki.org/wiki/Special:SkinDistributor [2] https://gerrit.wikimedia.org/r/#/c/174777/