Here a series of covers from a simpler time...the mid 1990s. In 1996 and 1997, DC and Marvel released a week's worth of comics called Amalgam Comics, which were made up of a mixture of DC and Marvel characters. They got a number of their top creators at the time to work on the projects, and the results were mostly quite fun.
An interesting thing to note is how you can easily tell the ones produced by DC from the ones produced by Marvel, because Marvel was not putting creator credits on their covers back then (they did not start until 1997).
1996 - THE FIRST WAVE OF TITLES
1997 - THE SECOND WAVE OF TITLES
What was your favorite title?
Super Soldier was mine (Mark Waid and Dave Gibbons?!? Wow!).