One of the tough tasks in web development and in particular CSS styling, is to find the RGB and hexadecimal value of uncommon colours. As a web developer working in CSS, I longed to give that nice blue/green tinge colour for my UI and always struggled with the hexadecimal value. Particularly in finding the same for colours I find in other sites.
Thanks to the IE9 Developer Toolbar which has this nice colour picker, one can find the hexadecimal code (and the RGB equivalent) from any web page.
To demonstrate, lets visit www.bing.com (Bing home page has a nice background photo every day 
). Open the Developer Toolbar by hitting F12.
From Tools – select “Show color picker”
Then, when you tab to the main browse window, you will notice a color picker icon showing up. Point it to the colour (it can be background or image) and you will be able to see the hexadecimal value of the same
In my case, I pointed to the nice sunset background (which am sure most of you love ) and I could get the hex value.
Small utility, hope it helps you.
Cheers !!!