My opinion is that the site has to be USABLE.
Eye-candy is good, and should be given to as many users as possible but, the question is: does the gray background of the image render the site impossible to use?
Supposing you have a substantial IE6 user base, are these users really complaining about that?
Or do you have 1 person out of the 100 that use IE6 complaining?
Now people say that the clients pay and you have to do what they say etc etc... Well, it's YOUR role to TEACH the client why IE6 should NOT be supported anymore.
Show them that:
1) the site WORKS (i.e. you can read content, submit forms etc), so the IE6 users will be able to use it
2) you can put some "hints" like "you have a crappy browser, don't complain if websites suck with that" (maybe in a slightly more polite way)
3) show them that even Internet giants dropped support for IE6. Why should you keep it? Do you really want to live in the past?
