background: url(img_flwr.gif) right bottom no-repeat, url(paper.gif) left top repeat;

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 300px;
            height: 300px;
            border: 1px solid #ccc;
            background: url(img/234.jpg) no-repeat 10px 10px,url(img/345.jpg) no-repeat;
        }
    </style>
</head>
<body>
    <div class="box">
    </div>
</body>
</html>

[css3] 多背景属性background_html

[css3] 多背景属性background_html_02