Corflu 30 (Portland, Oregon, May 3rd-5th, 2013) has added a FAAn Award category of Best Fanzine Cover for fanzines published in 2012. The full ballot is available at the Corflu website.
This page shows covers of on-line fanzines for 2012 which are hosted at eFanzines (and some elsewhere), and also includes "paper-only" fanzine covers for which I have images (this section also shows "paper-first" fanzines published in 2012 which did not appear on line before the end of the year).
I'll be happy to add any missing issues for both on-line and paper fanzines on receipt of scans. Please email cover scans to me at: firstname.lastname@example.org
The covers in each section are in reverse chronological order (more or less). For on-line fanzines, larger versions of the cover art may be seen by clicking through each cover and viewing the corresponding issue. For paper-only fanzines, the description also shows editor/artist in parentheses, and the link leads directly to a larger cover image.