Banjer

Hi, I will try to explain but I am not a very good with this stuff and with english.
Anyway, you have to set the css class from the menu section and then you have to modify the css file of your theme adding something like that.
I hope this is will be helpful

/*
Theme Name: spun Child
Description: Child theme for the spun theme
Author: Davide
Template: spun
*/

@import url("../spun/style.css");

.main-navigation {
 text-align: start;
}

.main-navigation a {
 text-indent: -9999em;
 width: 50px;
 height: 50px;

}

#masthead {
opacity: 1;
}

.menu-soundcloud  {
  background-image: url(http://www.albertodati.com/wp-content/uploads/2013/08/sc.png) !important;
  background-repeat: no-repeat !important;
  background-position: left center;

}

.menu-soundcloud:hover {
  background-image: url( http://myname.com/wp-content/uploads/2013/08/sccolor.png) !important;
}

.menu-facebook  {
  background-image: url(http://www.myname.com/wp-content/uploads/2013/08/fb.png) !important;
  background-repeat: no-repeat !important;
  background-position: left center;

}

.menu-facebook:hover {
  background-image: url( http://www.myname.com/wp-content/uploads/2013/08/fbcolor.png) !important;
}

.menu-twitter  {
  background-image: url(http://www.myname.com/wp-content/uploads/2013/08/tw.png) !important;
  background-repeat: no-repeat !important;
  background-position: left center;

}

.menu-twitter:hover {
  background-image: url( http://www.myname.com/wp-content/uploads/2013/08/twcolor.png) !important;
}

.menu-youtube  {
  background-image: url(http://www.myname.com/wp-content/uploads/2013/08/yt.png) !important;
  background-repeat: no-repeat !important;
  background-position: left center;

}

.menu-youtube:hover {
  background-image: url( http://www.myname.com/wp-content/uploads/2013/08/ytcolor.png) !important;
}

.menu-flickr  {
  background-image: url(http://www.myname.com/wp-content/uploads/2013/08/fl.png) !important;
  background-repeat: no-repeat !important;
  background-position: left center;

}

.menu-flickr:hover {
  background-image: url( http://www.myname.com/wp-content/uploads/2013/08/flcolor.png) !important;
}

It works !!!! Yeah thank you very much 🙂