Firefox and IE allow users to impose color schemes while browsing, but
this method changes all text and background to the same two colors.
This ruins the full use of each page. For example, in Gmail, the star
feature becomes useless.For another, regular text and hyperlinks
become indistinguishable. So this solution is only partial.

This remains true for other websites and for Windows as well. Both
Vista and XP have high-contrast color schemes, but there are both
aesthetically unappealing (Visually impaired does not equal
aesthetically unaware) and more problematic then helpful.

Is this something that Google could/will implement? Is this something
a third-party could do well? There are some third party tools (e.g.
Firefox's Accessibar), but none are subtle enough to retain the full
nature of each web page. Is anyone up for the challenge?

Thanks!