Mess with your users

You can have a bit of fun with filters and pseudo element selectors for all type of form elements. Today I propose to have fun with <input type="color">

/* http://tjvantoll.com/2013/04/15/list-of-pseudo-elements-to-style-form-controls/?utm_source=html5weekly&utm_medium=email */
::-webkit-color-swatch { 
  -webkit-filter: invert(100%);
}

::-webkit-color-swatch-wrapper {
   padding: 0;
 }

Live demo (Chrome only)

Based on the article List of Pseudo-Elements to Style Form Controls.