Thank you all for your suggestions. They were all excellent. I looked at lots of backing fabrics and chose one from Fabric.com. It is a repro from Judi Rothermel (designer of lots of Civil War fabrics) and I think it is a perfect solution. It is tan background with small red/blue outlined flowers sort of swaying in the wind. The focus fabric on the top is a bluish red with light blue flowers accented with tan. I think it's going to look great!