Rich Radio buttons by Travis Arnold (http://cssdeck.com/labs/ldmtsmfk)

index.html

<div>
<input type="radio" name="radio" id="radio1" class="radio" checked/>
<label for="radio1">First Option</label>
</div>

<div>
<input type="radio" name="radio" id="radio2" class="radio"/>
<label for="radio2">Second Option</label>
</div>

<div>  
<input type="radio" name="radio" id="radio3" class="radio"/>
<label for="radio3">Third Option</label>
</div>

<div>	
<input type="radio" name="radio" id="radio4" class="radio"/>
<label for="radio4">Fourth Option</label>
</div>

style.css

body {
  font-family: sans-serif;
	font-weight: normal;
	margin: 10px;
	color: #999;
	background-color: #eee;
}

form {
	margin: 40px 0;
}

div {
	clear: both;
	margin: 0 50px;
}

label {
  width: 200px;
  border-radius: 3px;
  border: 1px solid #D1D3D4
}

/* hide input */
input.radio:empty {
	margin-left: -999px;
}

/* style label */
input.radio:empty ~ label {
	position: relative;
	float: left;
	line-height: 2.5em;
	text-indent: 3.25em;
	margin-top: 2em;
	cursor: pointer;
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
}

input.radio:empty ~ label:before {
	position: absolute;
	display: block;
	top: 0;
	bottom: 0;
	left: 0;
	content: '';
	width: 2.5em;
	background: #D1D3D4;
	border-radius: 3px 0 0 3px;
}

/* toggle hover */
input.radio:hover:not(:checked) ~ label:before {
	content:'\2714';
	text-indent: .9em;
	color: #C2C2C2;
}

input.radio:hover:not(:checked) ~ label {
	color: #888;
}

/* toggle on */
input.radio:checked ~ label:before {
	content:'\2714';
	text-indent: .9em;
	color: #9CE2AE;
	background-color: #4DCB6D;
}

input.radio:checked ~ label {
	color: #777;
}

/* radio focus */
input.radio:focus ~ label:before {
	box-shadow: 0 0 0 3px #999;
}