For the month of February there are some inception levels of Neal Adams in the variant covers from DC Comics. We have Neal Adams, playing homage to himself through 25 different covers. As an added bonus I not only was able get the color covers but Neal Adams released the pencils for each cover as well!
Update 9/6/15 with more covers. I now have the current slate of 41 known covers represented.
This October Marvel is releasing Hip-Hoop Variant Covers for 27 different comics. As far as I can tell this is the complete list of covers they will be releasing. I saw reports of there being 50 different covers but that changed to 25, and then I was able to find 31. I’ll update this post with any additional covers if they wind up actually creating them.
This March Marvel had a “Women of Marvel” theme of Variant Covers spot lighting lady creators. I got the complete collection below.
DC continues their theme variant covers in July (2015) with Teen Titans Go! There will be 23 total spanning across various books. This is going to take place once the Convergence Event is over so there are a lot of new titles joining the fold this time.
Comic Books and Cats 