Following my back-to-back reviews of the Fantastic Four scripts penned by Michael France and Doug Petrie, it is time to do something a little different.
This is exclusive concept art by Tim Flattery, who drew designs for 20th Century Fox's Fantastic Four. As noted by the drawings, the artist created these pieces in 1999. Chris Columbus had left the director's chair by this point (though he would stay on as producer), and Fox was eyeing Raja Gosnell to helm the movie.
First, here is a picture of the Fantastic Four as a team. This piece of concept art depicts the "4" logo as being over the right side of Reed and Johnny's chests, which resembles their "Heroes Reborn" costumes from the comics. This was later used in the 2005 film. Note Sue Storm's costume design, which appears to be based on the character's post-Malice look.

Doctor Doom is drawn with a silvery, metal mask that resembles a patchwork of bandages. In the 1996 France script, his armor is created as a result of an nanotechnology experiment gone horribly wrong, and it was described as having an H.R. Giger influence, with hints of scarring around the eye slits.
Shown here is concept art of how the Fantastic Four's costumes would have looked in the film. Interesting to note the black collars were omitted in favor of silver. Furthermore, Paul Walker was considered for the role of Johnny Storm, so it is possible that he was used as a template for the character in these drawings.
Finally, these are some ideas for the Fantastic Four's headquarters, Four Freedoms Plaza. Flattery drew it as a post-modern skyscraper with a "4" design to be seen on the top.