CSS to make the output of Jetpack Subscription widget better in Genesis child theme, News 2.1.2. Details with screenshots: https://twitter.com/srikat/status/422551589824376832

style.css

.jetpack_subscription_widget .widget-wrap {
	background: url("images/enews.png") no-repeat 260px 15px;
}

#subscribe-email #subscribe-field {
	width: 175px;
	padding: 5px;
	font-size: 13px;
	margin: 10px -2px 0 0;
}

#subscribe-email, #subscribe-submit {
	float: left;
}

#subscribe-submit input[type="submit"] {
	margin: 9px 0 0 1px;
}

.after-post-ad {
	background: #F5F5F5 url("images/enews.png") no-repeat 550px 7px;
}

.after-post-ad .widget-title {
	text-align: center;
}

.after-post-ad form {
	max-width: 300px;
	margin: 0 auto;
}