I realize you said that you're on a budget, but I would go with a white or off-white or even a pale gold for the background. I think the background is too busy for a silhouette quilt. Just my opinion.
I looked up some pics of silhouette quilts & most have a light, "un-busy" background.
http://www.google.ca/search?q=silhou...w=1024&bih=605