Here's a quick and dirty poster/cover I made for a theoretical Call of Duty/Transformers crossover game.
I love the idea of playing a typical first-person war game and suddenly all of the enemy military vehicles turn into robots and start attacking. Of course, you'd have to team up with Prime and the gang to take them down.
I work at Activision and have been jokingly pitching this idea for ages!
Anyway, here's my tongue-in-cheek homage to that idea.
I did this quite quickly during a couple of lunch breaks at work - the image is more or less mirrored, so it didn't take long to put together. All done in Photoshop.
You can see the full size version here on my Devart page: http://jamie-egerton.deviantart.com/