LESS schemes

complementary.less

/* 
http://designshack.net/articles/css/10-less-css-examples-you-should-steal-for-your-projects/

Mixin 

*/
@base: #663333;
@complement1: spin(@base, 180);
@complement2: darken(spin(@base, 180), 5%);
@lighten1: lighten(@base, 15%);
@lighten2: lighten(@base, 30%);
 
/* Implementation */
.one   {color: @base;}
.two   {color: @complement1;}
.three {color: @complement2;}
.four  {color: @lighten1;}
.five  {color: @lighten2;}

subtle.less

/* 
http://designshack.net/articles/css/10-less-css-examples-you-should-steal-for-your-projects/

Mixin */
@base: #663333;
@lighter1: lighten(spin(@base, 5), 10%);
@lighter2: lighten(spin(@base, 10), 20%);
@darker1: darken(spin(@base, -5), 10%);
@darker2: darken(spin(@base, -10), 20%);
 
/* Implementation */
.one   {color: @base;}
.two   {color: @lighter1;}
.three {color: @lighter2;}
.four  {color: @darker1;}
.five  {color: @darker2;}