Nick Cates Clearing for RW 6

Nick CAtes Clearing theme is beautiful and I wan to buy for a client, but I have RW6 and don’t want to upgrade the computer or buy RW7 at this time. Does anyone know if the banner could be added by way of some CSS? something like #feature {background-image: url(%resource(my-image.jpg)%);}?? It would need to act just like the theme preview. Thank you!