I absolutely love the Meteor Eyes by Torrie Jayde here: http://torriejayde.tumblr.com/post/153462238994/lilsimsiecc-scytheee-i-got-a-request-for-some
The ones under Non-defaults show up in the eye category without replacing the default Maxis eyes. Use the Simfileshare link because the dropbox one doesn't work.
I also use Daydreamin Eyes by Reticulates here: http://reticulates.tumblr.com/post/147472551686/daydreamin-eye-set-18-ea-colors-as-default-first
The zip file includes three versions, so the file that says BonusNondefault at the end is the one that shows up in eyes category without replacing.
Hope that helps. :)