Hi jamarrett
That icons are font-awesome icons and they are loaded trough a css file /templates/gk_cloudhost/css/font-awesome3.css
HERE you can find a list of all icons available
If you indeed want to upload and show your own icon then you will need to apply a custom css code to the file font-awesome3.css
Let's say you want to change your image at the same place of the envelope icon then edit file at line 134
.icon-envelope:before {
content: "\f0e0";
}
change that line in
.icon-envelope:before {
content: "url(image.jpg)";
}
where url image.jpg will be the path for your own icon image
Hope that helps
Regards