i followed kmaninaustin and Zulfikar Nore recommendations/links to do a child theme to update footer color. it worked BUT, for an existing twenty fourteen site,
.site-footer {
background-color: #3AD;
knocked out the existing header image and the existing header menu. reading the http://codex.wordpress.org/Child_Themes page it makes it sound like nothing will be effected in the parent theme. this is my first child theme but i don't think i deviated from the instructions.
my test site http://dryduffelbags.com/
the header image is gone. the menu is gone. what you see in the black header bar are the Pages i created and WP auto puts them there after it removed the menu, it's NOT from the Menu system.
(what you see in the thin blue bar is the "Dropdown Menu Widget" plugin i am tinkering with.