How do you change theme background?

hey guys,

I originall had Noire theme using windows blinds. My background wall paper was the original Noire background with the white and silver and green spaceship looking abstract. After installing the Eminence theme, my background was replaced with a new windows background. I can't seem to find my old original Noire background. I even tried reinstalling WindowBlinds and reloaded the Noire theme, but the original background still won't show up. How do I get that background back?