The lobster-red appearance of Wonder Woman on the cover is a result of the condition of becoming 'god-like' along with Superman and Batman in the course of the Kurt Busiek storyline.

Trinity #13 page by Faucher and Derenick
Cover to Trinity #13 by Jim Lee (Batman and Superwoman)
Mark Bagley page from Trinity #37 (Batman, Superman and Wonder Woman fight)
Scott McDaniel Page from Trinity #37 (Punch and Jewelee)
Scott McDaniel Joker Page from Trinity #37 ("Hard and shiny is so brutalist, isn't it?")
Mark Bagley art from Trinity #37 (Batman, Superman and Wonder Woman lament all the bloody business)
Jesus Merino Wonder Woman art from Trinity #43
Mark Bagley art from Trinity #43 ( "calling Superman" fake suicide attempt )
Review of issue #37 of Trinity (Titled "Make it more wooden!")
Cover to Trinity #3 art by Carlos Pacheco and Jesus Merinio (June 2008)