I know it to late and they are not really posters but thought I might share. These are based on Promo shots for TV shows

My Nerdy Sitcom characters vs the Big Bang Theory (picture inset)

(click to enlarge)

My Robot Wars Reboot vs Battle Star Galactica (2004)

BSG Last super promo pick

Admittedly I did take the background for the hanger from the original image so it probably wouldn't count anyway but it still looks cool to me.

The are fun to do. Unfortunately I didn't see the announcement until it was all over. I could have done some cool Wizard School (HP) posters.

Ray Higgins
4D Fans