Promotional poster showing all of the posters in the series. The Third Eye also put out a series of postcards and jigsaw puzzles with the same designs. Overall, the combination of Marvel’s illustration superpowers with the psychedelic mindset (the third eye enables metaphysical sight, in mystical traditions) was extremely successful and influential. Not all of the posters are winners (Spider-Man doesn’t really fit), and the exclusion of Steranko’s Nick Fury is unaccountable. Jack Kirby’s Fantastic Four (below) is probably my favorite. You can see close-ups of most of the posters here.
You can see original Third Eye designs here.
(Images via Patrick Owsley and Cap’n’s Comics)
2 Warps to Neptune 
That Fantastic Four poster is…well…FANTASTIC! And you’re right, those Steranko Fury’s would have been a natural fit.