.ecwid-paymentBeanStream {
    background-image: url("http://i.imgur.com/MJyVHaX.gif");
    height:25px;
    width:83px;
}

.ecwid-paymentPaypal {
    background-image: url("http://i.imgur.com/MJyVHaX.gif");
    height:25px;
    width:83px;
}

div.ecwid-PaymentMethodsBlock-PaymentOption-htmlBlock img {
max-width: 100%;
visibility: hidden;
}