I bet most of the people like colours.
Yellow star is more visible than grey star.
Tooltip background is yellow in a colour scheme of an operating
system. So what?
Same colour scheme of same operating system has grey inactive title
bars and menus. Does this mean that grey is banned too?
And tooltip text is blue, so blue is out too. Window/menu text is
black, let's eliminate that too.
Window background is white, and so on, are there any colours left what
are not specific to something somewhere?
Set yourself a grey colour scheme if you are so much against colours.
Min/max/restore buttons of chrome have their own colour (and shape and
size) not what Windows uses, Chrome is only partially using Windows
colour scheme and theme.
I would like to see exactly the opposite from Google in their all
applications: using more contrasts.
The reason is that sometimes is very hard to find controls/menus
because is everything is greyscale (i.e. in Gmail's default colour
scheme the checkboxes), and this is especially true for older people
or anyone with less good sight.
My parents and parents in law although in their 50's have difficulties
using Gmail for this reason.
Colours are good and should be used more and better.
There used to be good designers at Google, is it possible that all of
them left?
UI should be tested on average screens too, if something looks good on
a 22" professional screen doesn't necessarly mean that it will look
good on the average user's 10-15" average/low quality screens,
especially on CRT ones.