CSS Colour Names is a really handy resource provided by Neil Orange Peel.
Rather than listing a dull hexadecimal value in your CSS, why not list an actual descriptive name? There are over 140 colour names listed in CSS, many of which are gorgeous and are handily referenced on Neil’s website.
There are also HEX and RGB equivalents provided for each colour, which you’ll still need for Photoshop and other applications that don’t recognise CSS colour names.
Visit colours.neilorangepeel.com to get started.