<select id="sel">
<option value="http://conquista.nexolocal.com.es/nl_imagenes/nl_posting/5/18/280/14021453/1329877214_1040413.jpg">electrica</option>
<option value="http://www.conservatorioteresaberganza.com.es/wp-content/uploads/2010/07/489426_guitarra-clasica.jpg">española</option>
</select>
<!-- urls como valor de los options-->
CSS
body {
/*fondo por defecto*/
background: url("http://conquista.nexolocal.com.es/nl_imagenes/nl_posting/5/18/280/14021453/1329877214_1040413.jpg");
}
JavaScript
/*tomamos el valor de los option y lo asignamos al background de <body> cuando onchange se produzca sobre #sel*/
window.onload = function(){
document.getElementById("sel").onchange = function(){
document.body.style.backgroundImage = "url(" + this.value + ")";
}
}
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