You can certainly get close with some neat CSS3 effects (text-shadow and gradients)
http://jsbin.com/UCokedat/1/edit
.fa-user {
color: white;
background-color: lightgrey;
padding: 40px 45px;
font-size: 50pt;
border-radius: 50%;
text-shadow: 1px 1px 1px silver;
text-shadow: inset 1px 1px 1px #eee;
background: rgb(226,226,226);
background: -moz-linear-gradient(-45deg, rgba(226,226,226,1) 0%, rgba(219,219,219,1) 50%, rgba(209,209,209,1) 51%, rgba(254,254,254,1) 100%);
background: -webkit-gradient(linear, left top, right bottom, color-stop(0%,rgba(226,226,226,1)), color-stop(50%,rgba(219,219,219,1)), color-stop(51%,rgba(209,209,209,1)), color-stop(100%,rgba(254,254,254,1)));
background: -webkit-linear-gradient(-45deg, rgba(226,226,226,1) 0%,rgba(219,219,219,1) 50%,rgba(209,209,209,1) 51%,rgba(254,254,254,1) 100%);
background: -o-linear-gradient(-45deg, rgba(226,226,226,1) 0%,rgba(219,219,219,1) 50%,rgba(209,209,209,1) 51%,rgba(254,254,254,1) 100%);
background: -ms-linear-gradient(-45deg, rgba(226,226,226,1) 0%,rgba(219,219,219,1) 50%,rgba(209,209,209,1) 51%,rgba(254,254,254,1) 100%);
background: linear-gradient(135deg, rgba(226,226,226,1) 0%,rgba(219,219,219,1) 50%,rgba(209,209,209,1) 51%,rgba(254,254,254,1) 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#e2e2e2', endColorstr='#fefefe',GradientType=1 );
}