-> If you go with a light footer background, then the Footer Contact Widget icons (should be changed). You can edit and replace the images in folder css/css-images. They are called:
The same icons are used for the sidebar Widget contact, with darker colors. They are named similary, but with “_sidebar” added at the end.
-> The same should be done for footer Social Icons. In this case the image that you should edit is in css/css-images/socialfooter.png