If a customer wants the social icons in the footer to display in the actual social media colours, you can add this to the bottom of the timber.scss.liquid file. Colour reference: http://brandcolors.net/
.icon-twitter { color: #55acee; }
.icon-facebook { color: #3b5998; }
.icon-pinterest { color: #cc2127; }
.icon-google { color: #dd4b39; }
.icon-instagram { color: #3f729b; }
.icon-tumblr { color: #35465c; }
.icon-youtube { color: #b31217; }
.icon-vimeo { color: #1ab7ea; }
.icon-fancy { color: #3f454d; }