In the skin.less you can use some variables and mixins
to insert font parameters and color values from color schemes:
===============================================================


Fonts
---------------------------------------------------------------
Each variable and mixin can start from one of the next slugs (put it instead @xxx in the variable names below):
@h1 ... @h6	- headers
@p			- plain text
@link		- links
@info		- info blocks (Posted 15 May, 2015 by John Doe)
@menu		- main menu
@submenu	- dropdown menus
@logo		- logo text
@button		- button's caption
@input		- input fields

// Font variables:
@xxx_ff 	- insert 'font-family' parameter in the rule
@xxx_fs 	- insert 'font-size'
@xxx_lh 	- insert 'line-height'
@xxx_fw 	- insert 'font-weight'
@xxx_fl 	- insert 'font-style'
@xxx_td 	- insert 'text-decoration'
@xxx_mt 	- insert 'margin-top'
@xxx_mb 	- insert 'margin-bottom'

.xxx_font()		- mixin to insert rule with all font's parameters for specified slug
.xxx_margins()	- mixin to insert rule with margins for specified slug


Colors
---------------------------------------------------------------
Each mixin below can receive one of the next color slugs:

// Accented elements
accent1			- theme accented color 1
accent1_hover	- theme accented color 1 (hover state)
accent2			- theme accented color 2
accent2_hover	- theme accented color 2 (hover state)		
accent3			- theme accented color 3
accent3_hover	- theme accented color 3 (hover state)		

// Headers, text and links
text			- main content
text_light		- post info
text_dark		- headers
inverse_text	- text on accented background
inverse_light	- post info on accented background
inverse_dark	- headers on accented background
inverse_link	- links on accented background
inverse_hover	- hovered links on accented background

// Block's border and background
bd_color		- border for the entire block
bg_color		- background color for the entire block

// Alternative colors - highlight blocks, form fields, etc.
alter_text		- text on alternative background
alter_light		- post info on alternative background
alter_dark		- headers on alternative background
alter_link		- links on alternative background
alter_hover		- hovered links on alternative background
alter_bd_color	- alternative border
alter_bd_hover	- alternative border for hovered state or active field
alter_bg_color	- alternative background
alter_bg_hover	- alternative background for hovered state or active field 


// Color mixins:

// All mixins .scheme_*() apply css rules to selector INSIDE class .scheme_xxx (not for selector with class .scheme_xxx)
// For example:
// <div class="wrapper scheme_dark">
// 		<div class="insider"></div>
// </div>
// .wrapper { .scheme_bg_color(accent1); }		// Apply default accent1 color from parent color scheme (not from scheme_dark)
// .insider { .scheme_bg_color(accent1); }		// Apply accent1 color from scheme_dark

.scheme_color(slug)				- set 'color' parameter for current rule. For example: .scheme_color(accent1);
.scheme_color(slug, opacity)	- set 'color' with opacity (0.0 - 1.0)

.scheme_bd_color(slug)			- set 'border-color'
.scheme_bdt_color(slug)			- set 'border-top-color'
.scheme_bdb_color(slug)			- set 'border-bottom-color'
.scheme_bdr_color(slug)			- set 'border-left-color'
.scheme_bdl_color(slug)			- set 'border-right-color'

.scheme_bg_color(slug)			- set 'background-color'
.scheme_bg_color(slug, opacity)	- set 'background-color' with opacity (0.0 - 1.0)
.scheme_bg(slug)				- set 'background' with specified color

.scheme_bg_image()				- set 'background' with image and image2 from scheme 
.scheme_alter_bg_image()		- set 'background' with alternative background image from scheme 

.scheme_box_shadow(slug, rules)	- set 'box-shadow' with specified color and shadow parameters. You can use %c for color insertion or %r, %g, %b for it rgb components.
									For example:
									.scheme_box_shadow(accent1_hover, ~'inset 0 0 0 110px %c');
									.scheme_box_shadow(accent1_hover, ~'inset 0 0 0 110px rgba(%r, %g, %b, 0.8)');

// All mixins .self_*() apply css rules to selector WITH class .scheme_xxx
// For example:
// <div class="wrapper scheme_dark">
// 		<div class="insider"></div>
// </div>
// .wrapper { .self_bg_color(accent1); }		// Apply accent1 color from scheme_dark
// .insider { .self_bg_color(accent1); }		// Not apply rules!!!

.self_bg_color(slug)			- set 'background-color' to selector itself



Utility mixins (disabled in this version)
---------------------------------------------------------------
.clr_after()					- break floating after this element

.bd(width:1px, style:solid)		- add border-width and border-style parameters
.bdt(width:1px, style:solid)	- add border-top ...
.bdb(width:1px, style:solid)	- add border-bottom ...
.bdl(width:1px, style:solid)	- add border-left ...
.bdr(width:1px, style:solid)	- add border-right ...

.bd_radius(r)					- add border-radius
.bdtl_radius(r)					- add border-top-left-radius
.bdtr_radius(r)					- add border-top-right-radius
.bdbl_radius(r)					- add border-bottom-left-radius
.bdbr_radius(r)					- add border-bottom-right-radius

... and much more (see in the file core/css/_utils.less)