@Dudley: Social icons used in this theme is image. So, you cannot change that. You can just change either to grey or to the their original Color.
For example, if you want your current social icon color changed from Grey to hover state then you can add the following CSS in “Appearance => Theme Options => Custom CSS” box.
.social-profile ul li.facebook a {
background-position: 0 -44px;
}
.social-profile ul li.twitter a {
background-position: -44px -44px;
}
.social-profile ul li.google-plus a {
background-position: -528px -44px;
}
.social-profile ul li.you-tube a {
background-position: -132px -44px;
}
.social-profile ul li.flickr a {
background-position: -440px -44px;
}
.social-profile ul li.instagram a {
background-position: -704px -44px;
}