There is few tricks to know

Credits

The project Fifty shades of <color> use jQuery & a wonderful script of Tim Pietrusky, called _select.

Licensed under Apache 2.0

This tool is a joke, and was inspired by the title of the book "Fifty shades of Grey" by E. L. James.

Try those colors :

Change shades direction:

Fifty shades of #000000

Change the 6 hexadecimal color value ... With an other 6 hexadecimal value..