How to change read and unread node icons?

I don't want anything fancy like a new icon for each node. I just want to change the read icon to one image, and the unread icon to another image.

This doesn't work:

.node--unread .node-icon {
background-image: url(link) !important;
background-repeat: no-repeat !important;
background-position: center !important;
}
.node--read .node-icon {
background-image: url(link) !important;
background-repeat: no-repeat !important;
background-position: center !important;
}

It...

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