Icon for service section

Hi,i would like to add some nice icon in service section in home page, such as "web service 1 - 2 - 3 - 4" of your demo. But for this section, there is not the fa-icon script, but i have to upload single image for each section. Well... i like the style of the icon preloaded, where i can find this kind of icon? Another question, i dont find any customization for the color of this section (the title and the circle of the icon). How to change this color? Thank You