Request: Set Droplist 'Background' Image

A use case that I come across quite a bit is where droplists are styled with a ‘background’ image instead of the standard CSS classes available. I currently use JS on pageload to create these styles. Would be great if this was native and could probably just use this currently disabled button.

For instance:

select:not([multiple=multiple]) {
    height: 33px;
    background: url(/form-fields-sprite.png) 0 -37px no-repeat,
    url(/form-fields-sprite.png) 100% 0 no-repeat;