Kuorinka theme is build also child themes in mind. You’d say it’s child theme friendly. Justin Tadlock have build Stargazer and Saga themes with the same goal in mind. There are some differences but the basic idea is the same. Creating child themes should be easy, fun and would not require lot’s of code skills.
Kuorinka theme is accessibility-ready and translation-ready, have right to left support and includes Schema.org microdata. Try your best that child theme do not break those things.
New color schemes can be created in less than an hour because in parent theme
style.css I have Child theme friendly zone. I just copied the child theme friendly zone CSS in the child theme
style.css and searched and replaced all the colors I wanted. Note that parent theme styles are loaded automatically so there is no need to use @import rule. Konstantin Kovshenin has nice article about the subject even if I done it little bit differently.
I have plans the build several commercial child themes and they are available in Kuorinka Child theme pack.
To make my own and other job even more easier I have created an example child theme for Kuorinka. It includes guidelines how child theme should be created and what can be done via child theme.
In functions.php there are several things you can do but only one required.
If you use new fonts in child theme remember to enqueue fonts in admin header page with hook
admin_print_styles-appearance_page_custom-header and in editor using add_editor_style function. ThemeShaper have great tutorial how to add Google fonts to WordPress themes.
If you are using new fonts and styles in child theme, you need to add one file in css folder.
All child themes should have a
languages/theme-slug.pot file. Even if your theme doesn’t add new strings, the style.css headers should be translatable.
If you’re unfamiliar with this process, here are tutorials for creating a POT file:
First update header info in style.css file.
Then if you want to create new color scheme for Kuorinka there is Child theme friendly zone in parent theme. Just copy and paste the CSS rules in the child theme
style.css and search and replace all the colors you want to change.