Dear Roberto,
Site redesign task didn't require change icons mandatory ( i hope ).
For me, old icons were fine and I don't see any reason to change it - keeping some old elements during site upgrade is helpful because site doesn't change at all (user shock) and is still possible to find things by old element :)
Of course GUI matters but if icons / graphic don't indicate something important it's waste of application performance and corrupt usage comfort. I always prefer light-weight interface optimized for 1024x768 because some graphic element just waste page space (bandwith) then user has to scroll each subpage again & again to skip static element to read dynamic/desired content.
Let's me show extreme example:
allegro.pl/497_akcesoria.html
It's something like Ebay but in Poland - in 1024x768 about 90% of screen is always used by static element, so each sub page has to be scrolled again & again what makes people little off after longer browsing.
But seems my point of view is begin little old-school:
w3schools.com/browsers/browsers_dis ...
In big company people are still using good CRT display with 1024x768 and use effective any space of page is most important then nice view. I fully understand use graphic as important indicator like red warning sign "!" etc. But spam WWW with graphic is bad from performance, and in this way i hate included Flash too.
I don't believe that my layout win, because I see really good competitor project where players spent many hours to tune it. With my old-school like window application layout i just wanted to remind simple/raw theme, because it's code developing page not Photoshop e-zone.